Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68afd7f8cc26be2…

MALICIOUS

PDF

75.1 KB Created: 2021-04-07 18:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbfa7cd8e6dde2d1c8ab599155939e64 SHA-1: ac9da42c1607ee95c569c38f5eff29f0ae0892f8 SHA-256: a68afd7f8cc26be24f4d7c78390bfd17b5e791a286264175577a2b06d1e7d61b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm. The document body, though heavily obfuscated, contains references to wkhtmltopdf, suggesting it may have been generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/strik?utm_term=how+to+clean+instant+pot+duo+crisp+lid
    • http://lifeit.pro/kilezatojskzvg.pdf
    • http://fezibinuzot.iblogger.org/mitosis_and_meiosis_quiz.pdf
    • https://static.s123-cdn-static.com/uploads/4374835/normal_5ffae7b8f3cf5.pdf
    • http://smartradiobf.ru/pexunokdlmj9.pdf
    • https://cdn-cms.f-static.net/uploads/4454558/normal_6052f598e8669.pdf
    • https://cdn.sqhk.co/gixelotopa/bjcYSge/74341682025.pdf
    • http://giveaway2020.info/bejiwikaposivapugosems90g.pdf
    • http://4338bacchus.com/sorafudenorevenifuveyy3dp.pdf
    • http://verifiedbadge-lnstagram.com/gepilesutuxuponigefipirgjwsk.pdf
    • http://joxopenizimili.iblogger.org/tewufadijijipisonisi.pdf
    • http://moscowflowers.shop/duwufesopafefefulibeqv4p5.pdf
    • http://xogubafirugufa.iblogger.org/81651203173.pdf
    • https://cdn-cms.f-static.net/uploads/4383798/normal_602d8731e6a80.pdf
    • http://serviceforyou.site/4843190723802u4p.pdf
    • https://cdn.sqhk.co/rosubeno/jdJgcia/flip_the_gun_hack_apk_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4404497/normal_6019d9782e310.pdf
    • https://cdn.sqhk.co/gemadaruvow/0gjfn3s/zipodemez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://visasefiji.rf.gd/closing_stock_balance_sheet.pdf
    • http://luniluwanurezu.rf.gd/quadratische_gleichungen_bungen.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_off0000e788.bin
185cba35d8fa0f3e28a9702667281a8f47eb420752a191b51c621c38fe861c8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 5120 bytes
font_01_sfnt_off0000f913.bin
f9844c7e31d5007ee0f7bd4fa3c14ae12436c299302656262c0b0f9f6a584335		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 11308 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.