You are given huge JPEG (2.8 MB) with a hint of a hidden message in the image.
Loading the image into Aperi'Solve, it will give you a lot of information e.g. it contains 7 sub images but more interesting is:
Common password(s): Nissebanden, natskyggebryg, Flæskesteg, guldøl, flæskesteg, FLÆSKESTEG, NATSKYGGEBRYG, fokker, little, GULDØL, NISSEBANDEN, julegaver, JULEGAVER, _nor_VAN_gogh}, nc3{, a_RAMbrandt, IKKE julegaver, somethingsecret.txt, bmMze25vdF9leGFjdGx5, nissebanden, null
Already here you can smell the flag with: _nor_VAN_gogh}, nc3{ and a_RAMbrandt, but not exactly as the flag is NOT nc3{a_RAMbrandt_nor_VAN_gogh}.
There is however also a base64 encoded string bmMze25vdF9leGFjdGx5 which decoded is nc3{not_exactly and if we combine the information from above we get:
nc3{not_exactlya_RAMbrandt_nor_VAN_gogh}