BSO. Not a brand I'm afraid but an acronym of Bicycle Shaped Object. Your purchase looks to be made with basic componentry and a heavy budget steel frame. The front brake in particular looks like something from the 1980s and the bike as a whole (if it is as sold) looks like something I would expect to see in a branch of sports direct for around £80-90.
It may work but I wouldn't attempt anything too daring for fear of personal injury if it breaks. I hope you didn't pat too much for it.
Having said that, someone far more knowledgeable of the subject than me is sure to be along shortly to explain that it is actually a top-flight, sought after frameset and you have bagged a bargain.....