If you generate a bunch of random strings like that it will not match any patterns that your friend's brains recognize and those brains are going to categorize them into the "most unknown" bucket. If your friends are English speakers then there is a good bet that bucket is "Asian".
So it may not be at all that the words are similar to any individual Asian language. It may simply be that the brain is saying "None of these sounds and patterns are familiar, must be Asian, I don't know much about that".
The above statement (and the question as originally asked) require a pretty advanced understanding of a number of questions (e.g. How do people divide the world into language groups? What languages do people think of when asked with a classification task from a friend?), many of which I don't think are well studied or fully understood. My answer was an educated guess and I am doing research post-hoc per request. So obviously there is some confirmation bias at play. Take this with whatever grain of salt you want.
There are a number of techniques for identifying linguistic or phonetic similarity. The most applicable paper I could find is "A Perceptual Phonetic Similarity Space for Languages: Evidence from Five Native Language Listener Groups." They asked English listeners to “rank the languages according to their distance from English.” The three most similar were Dutch, Catalan, and Galician while the three most distant were Sindhi, Arabic, and Cantonese.
Of course, that leaves the question of "what language groups will an English speaker's brain be even considering?" Are Sindhi, Arabic, and Cantonese all "Asian languages"? I couldn't really even come up with any evidence of that in any direction.
My answer also requires an assumption that random gibberish will translate to "most unknown" language. That's by no means conclusive. For example, you can programmatically generate convincing psuedowords in a variety of languages (e.g. see http://crr.ugent.be/programs-data/wuggy). So what happens when the pseudowords are generated in the random way described? Does the brain still try and categorize them? Does it just hit a default case and throw them into the "most unknown" bucket as I theorized? I doubt there will be any research on that.
So, in conclusion, don't take my answer as any statement of fact. It's a vague question that's asking more about a cognitive phenomenon than a linguistic one.