Ecclesiastes is one mentioned a lot as well as the first 4 books of the OT. Even Matthew, Mark, Luke and John are all said to be written by students of rather than the Apostles.
I had one professor years ago say that during those times, The Gospel of Ted would not have gone over very well so a writer would place the name of an Apostle or someone close to Christ in order for people to believe it. Doesn’t mean that it is a false Gospel or Book. Mark is the first written and many believe that Mark actually wrote Gospel. Matthew, Luke came later and many biblical scholars believe they might have actually had a copy of Mark while writing their Gospels since all three have so much in common. John’s Gospel is different so that argument would not hold when viewing that Gospel.
I guess it is always up for debate on who wrote what, but we can take peace in knowing that all were inspired by God as were those that put all the manuscripts together.