If I had to make a crapshoot guess guess..based off the sling and the look of the wood, my first thought is it's Chinese. But, I would like to see more photos, the bottom of the butt stock, right side, even rifle manufacturing marks..the works.
Chinese can have the wire sling hangers on the side of the butt stock or on the bottom of the butt stock..it's dependent on the era it was made. One curiosity is I have, is if it has the cleaning kit hole in the stock, and the usual smaller lightening hole or were they plugged. If you look up an East German SKS, it is the only one that has a stock sling slot cut into the butt stock, somewhat similar to the K98, this... looks more like a copy of the M1 Carbine rear sling slot, which I don't see any Communist nation using.
I would say..in my opinion, that that is not a arsenal job, if by what ever chance it is..it is a one off, and of course, there is a very slight chance it's a troop field mod, but... it's awfully clean, square, straight and smooth for a knife hack job. There have been some oddities seen in the Middle East, they cobble the strangest things together, there is always that very small chance as well..
But, there are to many what if's....and my gut says... blame bubba..

I said I was an addict. I didn't say I had a problem.