Malicious PDF — malware analysis report

Static analysis result for SHA-256 4645a19bb392de39…

MALICIOUS

PDF

76.3 KB Created: 2021-03-27 20:35:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4988c22feb322ca1f22918a78bf9868e SHA-1: 363f4c8144a8954e656c04b93d2026c37b0a70cb SHA-256: 4645a19bb392de39eac875c8e8614b2b760227bd08f53fcfb83df0ce1958e5d7
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is likely a phishing lure. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojanized document. The document body, though heavily obfuscated, suggests a pretext related to academic questions, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://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