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) First seen: 2026-06-04
MD5: 6475b75859dc001868e1b6b36f5da529 SHA-1: d6665e3113beae4015a4441ec161b5c86276ee8e SHA-256: 4ff4840cdced3d99eb094d7eba9b4bb343b5dddfc990522be6774661b88150ef
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. The document body and heuristics indicate it uses a lure related to educational worksheets to entice users. The embedded URL, https://vilenefex.ru/strik?utm_term=2nd+grade+math+worksheets+money+printable, likely serves as a redirector to the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408475/normal_601476df85f54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413119/normal_60030cd202c0a.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/2014_census_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/59645871619.pdfIn PDF document text
    • http://electrumwallet.buzz/duxewitujisolokujo4n2c.pdfIn PDF document text
    • http://subonus.ru/43082846268sdcji.pdfIn PDF document text
    • http://portkamesto.site/marooned_person_synonyml4ycq.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/dojimemogitakupi3nfhs.pdfIn PDF document text
    • http://tvoy-ogorod.online/navidudamokumitexvb4p.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/98502176252.pdfIn PDF document text
    • https://rigavedisibabaz.weebly.com/uploads/1/3/4/9/134902328/pexuwod_witot.pdfIn PDF document text
    • http://bafakuvim.sportsontheweb.net/solid_angle.pdfIn PDF document text
    • http://wuwudikosegukem.mypressonline.com/radavafuwigoxinijepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496001/normal_5fd0e1a9bc453.pdfIn PDF document text
    • http://tazizinujumijoj.mywebcommunity.org/automorphism_group_of_a_graph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_600cf4a91a967.pdfIn PDF document text
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/kereji.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/ikea_high_chair_weight_limit.pdfIn PDF document text
    • http://kindraretterath.com/2004_honda_civic_ex_service_manualzu1zx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sabiwilurase.atwebpages.com/lorovawe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 5596 bytes
SHA-256: f5be4d74df06f35dea83302931333fa69538707f297517b364c34321fb2df526
font_01_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 11164 bytes
SHA-256: ae4a538f8257aa2543749a2a18b26a060e43481e20460ab18dec654bdf815cab
font_02_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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