Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef066ee7c82239b…

MALICIOUS

PDF

74.8 KB Created: 2021-03-18 21:23:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3f300ee4cb9a602c8b233b1401da4929 SHA-1: 756237dfa1068988a5bafb60be5d272a39999a1d SHA-256: 7ef066ee7c82239b42d03fb8be63353cd0f960bc39177fe58bf848a3db435efc
212 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. The primary attack pattern involves redirecting users to external URLs, with one URL identified as a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of numerous embedded URLs, many pointing to disposable hosting, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/award?keyword=armitage+shanks+doc+m+pack+pdf In PDF document text
    • https://cdn.sqhk.co/fujotojaxob/djd1gdh/i_swear_to_god_karen_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuzofi/5gjQGih/drum_machine_pad_hardware.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/ihWiajb/83019069475.pdfIn PDF document text
    • http://lordtrans.ru/beelzebub_anime_freelpto9.pdfIn PDF document text
    • http://andyhong.blog/kojenunao18gr.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/2RWiifV/wilefuzav.pdfIn PDF document text
    • http://eurosett.net/template_slip_gaji26r2p.pdfIn PDF document text
    • http://mugedly.xyz/hl-l3290cdw_series_default_passwordowee8.pdfIn PDF document text
    • http://jivevoradoto.22web.org/tegixijavomawinisegigi.pdfIn PDF document text
    • http://nixekagog.22web.org/what_are_the_types_and_classifications_of_antibiotics_and_their_actions_ati.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/kenmore_series_500_washer_manual.pdfIn PDF document text
    • http://pivojapigalotu.22web.org/41825697896.pdfIn PDF document text
    • http://discount50it.pro/pelicula_completa_vicente_fernandez_arracadasnpzwq.pdfIn PDF document text
    • http://nuwiratuzitezep.22web.org/heineken_malaysia_annual_report.pdfIn PDF document text
    • http://kudusakepupa.sportsontheweb.net/empirical_research_methods_poster.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/2007_jeep_jk_service_manualbtnkb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sebupakipukiw.epizy.com/2043009386.pdfIn PDF document text
    • http://poxizaxo.epizy.com/94565450141.pdfIn PDF document text
    • http://zesugipove.onlinewebshop.net/wanope.pdfIn PDF document text
    • http://xafinoligu.epizy.com/gosuzobegotugi.pdfIn PDF document text
    • http://tiruweditivunaw.myartsonline.com/52945346089.pdfIn PDF document text
    • http://veruzixiki.rf.gd/assignment_of_settlement_proceeds_form.pdfIn PDF document text
    • http://vovakupalujum.onlinewebshop.net/93402220026.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 5588 bytes
SHA-256: 7e817f4a678807300fba45265ce9c93e6f41bb40c126900452df2cb94c22e88e
font_01_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 11512 bytes
SHA-256: f5b1654b31d0e7c1a5ff07579a29b03be5bc1984b7a0ad8e635c1ebaab9db02f

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