Air carrier First Officer reported the aircraft experienced transponder and GPS failure due to potential GPS spoofing.

Narrative

GPWS incident occurred during Aircraft X's flight from LLBG to ZZZZ. During departure from LLBG; we experienced a GPWS pull-up aural warning. Despite normal pre-flight preparations; including awareness of potential GPS spoofing; I opted to disable the GPS and rely on airport latitude/longitude and DME/DME for navigation updates during the flight. The departure proceeded as usual; and we were cleared to 9000 ft. I had requested high speed to expedite clearance from the LLBG terminal area. Utilizing raw data DME and radio information to cross-verify the accuracy of the FMC; both sources indicated accuracy. However; shortly thereafter; we received a GPWS pull-up warning. At the time; flight conditions were VFR; with clear visibility of ground and water; exceeding 10 NM. The aircraft was well above the Grid MORA (Minimum Off-Route Altitude) and MSA (Minimum Safe Altitude). Given the visual confirmation of our surroundings; I did not initiate the escape procedure. Prior to the warning; the aircraft experienced failures of ATC left and right; transponders left and the GPS right. Based on these events; I suspect a spoofing attempt targeting our flight. Despite the incident; the flight continued to ZZZZ without further events.