Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff4840cdced3d99…

MALICIOUS

PDF

78.4 KB Created: 2021-04-15 20:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6475b75859dc001868e1b6b36f5da529 SHA-1: d6665e3113beae4015a4441ec161b5c86276ee8e SHA-256: 4ff4840cdced3d99eb094d7eba9b4bb343b5dddfc990522be6774661b88150ef
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to a suspicious domain, likely intended to host malicious content or redirect the user. The document body, though heavily obfuscated, suggests a lure related to '2nd grade math worksheets money printable', aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=2nd+grade+math+worksheets+money+printable
    • https://cdn-cms.f-static.net/uploads/4408475/normal_601476df85f54.pdf
    • https://static.s123-cdn-static.com/uploads/4413119/normal_60030cd202c0a.pdf
    • http://electrumwallet.buzz/duxewitujisolokujo4n2c.pdf
    • http://subonus.ru/43082846268sdcji.pdf
    • http://portkamesto.site/marooned_person_synonyml4ycq.pdf
    • http://lnstagram-copyright-supports.com/dojimemogitakupi3nfhs.pdf
    • http://tvoy-ogorod.online/navidudamokumitexvb4p.pdf
    • https://rigavedisibabaz.weebly.com/uploads/1/3/4/9/134902328/pexuwod_witot.pdf
    • http://bafakuvim.sportsontheweb.net/solid_angle.pdf
    • http://wuwudikosegukem.mypressonline.com/radavafuwigoxinijepe.pdf
    • https://cdn-cms.f-static.net/uploads/4496001/normal_5fd0e1a9bc453.pdf
    • http://tazizinujumijoj.mywebcommunity.org/automorphism_group_of_a_graph.pdf
    • https://cdn-cms.f-static.net/uploads/4374704/normal_600cf4a91a967.pdf
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/kereji.pdf
    • http://kindraretterath.com/2004_honda_civic_ex_service_manualzu1zx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fusidejebi/2014_census_report.pdf
    • https://s3.amazonaws.com/pevarijidasalop/59645871619.pdf
    • https://s3.amazonaws.com/telasebisu/98502176252.pdf
    • http://sabiwilurase.atwebpages.com/lorovawe.pdf
    • https://s3.amazonaws.com/jusuberu/ikea_high_chair_weight_limit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53c.bin
f5be4d74df06f35dea83302931333fa69538707f297517b364c34321fb2df526
pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 5596 bytes
font_01_sfnt_off0000f816.bin
ae4a538f8257aa2543749a2a18b26a060e43481e20460ab18dec654bdf815cab
pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 11164 bytes
font_02_sfnt_off00011e25.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 4324 bytes