Known to be fallacious? By Protestants, no doubt. A number of Fathers accepted the Septuagint as inspired by God and 2 Maccabees was part of that. Both the Orthodox and Catholic Church have accepted it for at least 1700 years. You should have said "it is my OPINION that 2 Maccabees is fallacious", perhaps also giving your reasons why you think that, rather than your proclamation that is at odds with a vast majority of Christianity.
Regards
http://www.apuritansmind.com/Apologetics/ApocryphaArticle4.htm The books are expressly stated by Gregory the Great as apocryphal, who was Pope of Rome (Morals. Lib. XIX. c. 16.) Eusebius says the same (Lib. De Temp.), as does Richard of S. Victor. (Except. Lib. II. c. 9.) and Occam (3 Part.Dial. Tract.. I. Lib. III c. 16) Will worship is seen in 2 Maccabees 12, where Judas Maccabees is praised for sacrificing to the dead, something God never commanded (See Leviticus 101-3). Judas is said to have been slain in 152 during the reign of Seleucide in Mac. 9:3; but 2 Mac. 1:10 he writes a letter to Aristobulus in the year 188, 36 years after his death (I wish I could do that!) So much more can be added, but I will add one more. Within the 2 Maccabean books, Antiochus is said to have died 3 different ways and in two different geographical locations. (See 1 Macc. 6:18, 16; 2 Macc. 1:16; 2 Macc 9, etc.) Josephus was not careful.