Hello AndreiF,
The only references I found to Azobrom online was from someone using it in a pinhole camera on the lomography site (
Film Used: Azobrom) and also on a site called
Camera Obscura. Both photographers are in Romania so it may well be the same person. At any rate, there is mention of the paper being made in 1996 in that second link, so possibly that person could give you more information if you reached out to them.
All I can add is that the BN 117 designation looks to be identical to coding used by Agfa and Agfa-Gevaert where BN denoted a 'Normal' Grade, which they considered to be Grade 3, the 11 meaning "White, Double Weight" if my papers here are consistent and the 7 being a "Silk" surface. So, I would say almost definitely that you have a fixed grade paper there, but all else is speculation on my part. Being a Bromide paper, if the name is any indication, it's a faster enlarging paper rather than a Chloride Contact Printing Paper. Oh, and, yes, fibre based. As I said, I'm merely speculating here, but hope that I might have pointed you in the right direction, at least.