Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c597a4c4c04bb9…

MALICIOUS

PDF

77.6 KB Created: 2021-03-27 20:35:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48066044aebde65c9ff070a38af4dda6 SHA-1: 983800ff6ff5470137f9f2aece9961d90dc1fffe SHA-256: f6c597a4c4c04bb9b2dd6290d1bac5476f8ebe3b81825db19295349c15acccfd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded URLs that are likely used to download malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to academic questions, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/award?keyword=abstract+algebra+questions+and+answers+pdf
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/rinalivelat.pdf
    • https://cdn-cms.f-static.net/uploads/4403273/normal_602073fa83695.pdf
    • https://cdn-cms.f-static.net/uploads/4412900/normal_6052013c23caa.pdf
    • http://wildber.store/english_to_bengali_alphabet59qp8.pdf
    • http://mebel-albero.ru/mcat_practice_test_freeco47e.pdf
    • http://vogudikomi.getenjoyment.net/xokutoluzolazawa.pdf
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5fcedc8dad2c9.pdf
    • http://feelslike35.com/balochi_dance_video83obw.pdf
    • http://questotzvezd.space/colornote_notepad_notes_apphgdmi.pdf
    • https://fixabewol.weebly.com/uploads/1/3/4/7/134711766/pulesaveluto.pdf
    • http://xolokukifimiv.sportsontheweb.net/denisufimiludikegoz.pdf
    • https://cdn-cms.f-static.net/uploads/4420245/normal_603126c94d853.pdf
    • https://motodamoz.weebly.com/uploads/1/3/1/4/131452818/6cb12.pdf
    • https://static.s123-cdn-static.com/uploads/4383574/normal_5fde52e15f4c7.pdf
    • http://idealica-italiaufficiale.site/104168681814e3cj.pdf
    • http://sakhavto.ru/beminedijisewkjx9w.pdf
    • http://youla-24.cc/monsters_inc_explaining_meme_templatehryu2.pdf
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/7558271.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gumegulaxi/answer_key_of_anthe_exam_2019.pdf
    • https://s3.amazonaws.com/wolina/85394274356.pdf
    • https://s3.amazonaws.com/wozowuledij/titanic_imdb_parents_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06c.bin
85c01f06269d640f5aa010142b24e4a274c7b1331bff34e97271eb00859c333e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 5672 bytes
font_01_sfnt_off000103c9.bin
402fc36a605ade4a2872d0f0319cac4b8cf2f1733be683f595e7c8073ae19dc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 10880 bytes