Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee598d905575e16…

MALICIOUS

PDF

79.4 KB Created: 2021-04-03 11:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf4a5845e518b13e674308982a1581e8 SHA-1: 444bf4e2d60b6758973dd6a24e21eabd6b22a64d SHA-256: dee598d905575e16aa25ec6bb338edfd76d1e607f02744385c76ae36162728ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, indicating a link farm or SEO poisoning attempt to direct users to potentially malicious websites. The document body is heavily obfuscated, but the presence of 'ankle block pdf' and the authoring application 'wkhtmltopdf' suggest a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/award?keyword=ankle+block+pdf
    • https://gemuxobupi.weebly.com/uploads/1/3/2/6/132682013/bdb36c.pdf
    • https://static.s123-cdn-static.com/uploads/4387581/normal_5fc732070cff4.pdf
    • http://4escam-bot.online/ivan_the_terrible_netflix_endingyhng5.pdf
    • https://cdn-cms.f-static.net/uploads/4378425/normal_6059a0faf1644.pdf
    • http://wide-take.top/why_is_my_cold_water_not_working_on_my_washing_machinehnrp0.pdf
    • http://vostokzapad.su/86984618336cksgj.pdf
    • https://cdn.sqhk.co/salejejo/7Phcgdn/xusulu.pdf
    • https://static.s123-cdn-static.com/uploads/4458826/normal_5feb63bedae17.pdf
    • https://guxovixig.weebly.com/uploads/1/3/5/3/135317997/kifake_mosasar_kiwuv.pdf
    • https://cdn.sqhk.co/sadebupunen/heChgJ8/fender_vmod_2_pickups.pdf
    • https://cdn.sqhk.co/rowofabuf/v6hgoja/street_soccer_flick.pdf
    • https://static.s123-cdn-static.com/uploads/4466376/normal_5ffcc9c2d5d2f.pdf
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5fe032ac4e6b2.pdf
    • https://cdn-cms.f-static.net/uploads/4495694/normal_604a13f8ad799.pdf
    • https://kokejegifuro.weebly.com/uploads/1/3/4/4/134477846/nupetuf.pdf
    • https://cdn.sqhk.co/nimawabej/im6sji1/college_football_national_championship_2019_predictions.pdf
    • https://vegilirebaj.weebly.com/uploads/1/3/1/0/131070576/4927634.pdf
    • https://cdn.sqhk.co/tuwetebep/yghGKie/saxazobisetulikugozud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_f8e7ce5237fc48dfb48e5cdd71d21eef.pdf?index=true
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_861563d2e6044a759827b85483d04670.pdf?index=true
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_073c2dfdeb1c4672ad0fa81d886ed905.pdf?index=true
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_7e940952534b48f98f0c090e373a50d7.pdf?index=true
    • https://e222b685-7c7f-4cee-b050-218328c89257.filesusr.com/ugd/c0232f_a423992224934166aff47c531b2886b8.pdf?index=true
    • 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_off0000fbf1.bin
c28899192e1fb28000d173fb7499a4c08168bb750f416bade6ab9377d614d050		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 4856 bytes
font_01_sfnt_off00010c92.bin
e1147d3b11db74136925cc4609927da688106bbbe506afaca4140505c0fef85a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 10516 bytes

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