Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51afecb404d73e7…

MALICIOUS

PDF

79.1 KB Created: 2021-03-27 23:13:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c0ae943947aa4afbe27364dfb806bd3 SHA-1: 9abe4cbd63150c571fb5ca2e5ef81c90e990e2ba SHA-256: e51afecb404d73e7319b06f2dd614c0a6b1093c742dba5378e88fa2b3a3dc35d
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is also listed as an IOC. ClamAV detection and ML classification strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure related to academic content, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=hamlet+act+3+scene+1+questions+and+answers+quizlet
    • http://summ-green.fun/que_es_taller_artesanal_definicionks2sq.pdf
    • https://static.s123-cdn-static.com/uploads/4446512/normal_5ff312ba17dd0.pdf
    • http://pubggaming.online/92799930627ayk20.pdf
    • http://bujenaro.scienceontheweb.net/pivazusid.pdf
    • https://static.s123-cdn-static.com/uploads/4452386/normal_5ff950639c5c8.pdf
    • http://nugowimabu.mywebcommunity.org/blood_relation_with_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4411228/normal_6039eb64414dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jexaziled.rf.gd/j._e._humphreys_introduction_to_lie_algebras_and_representation_theory.pdf
    • http://teluroluxeterez.myartsonline.com/boledevixosafezezawija.pdf
    • https://s3.amazonaws.com/poguvelefa/xusixasabawuzedavuvez.pdf
    • http://sugebajofurite.rf.gd/multiplying_and_dividing_fractions_word_problems_worksheets_with_answers.pdf
    • https://s3.amazonaws.com/tesodagiwor/wasugixakusatosofase.pdf
    • https://s3.amazonaws.com/palikuvexake/35753896902.pdf
    • https://s3.amazonaws.com/gorajikunobixi/how_to_apply_for_ebt_during_pandemic.pdf
    • https://s3.amazonaws.com/tojabixefova/blockbuster_bollywood_movies_hd.pdf
    • https://s3.amazonaws.com/piradi/90933120557.pdf
    • http://diwavubodinaroj.myartsonline.com/83095368749.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_off0000f711.bin
b72085d611916cf11ca0c26fca7076ebbd511dbcee7337992ad3ea70d4b2e39d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 5532 bytes
font_01_sfnt_off000109e0.bin
4c4c2d0a5e249cffa7b96f7c66b58037fef8280d7747b6b7f8b45c4a221e7717		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 10900 bytes

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