That's a Marder II based on a Panzer II Ausf. D or E, right?
That's correct. This particular Marder II has been linked with the SS.Pz.Jg.Abt. 5, but that's most likely wrong since the SS-Wiking donated the surviving two (out of 12) Marder II to the 50. Inf.Div. in June 1943.
That sheet metal mod at the rear has been associated with training vehicles, so maybe it came from a replacement and training unit (or it's the lone survivor from the GD).
Ed: 4. Panzer-Division also had one Marder II Ausf. D/E operational after 1943.
refer: Panzer Tracts 7-2, Nuts and Bolts 24