They are semitic actually. I do not personally subscribe to the Khazar theory because you can look at a Jew, wherever they may be, and they all share the same genetic markers (even the mizrahi and ethiopian ones). Kevin MacDonald does not subscribe to this theory either btw.
Further, ancient depictions of Jews even have the same markers we know today (large nose, kinky hair, etc).
They are the same people, but I think this subject is a waste of time ultimately anyway