Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e032cfd30682731…

MALICIOUS

PDF

70.4 KB Created: 2021-02-12 19:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c7c680e0975d5dd2602344bd4bbeb259 SHA-1: e53b47e2e125a6299bec25f933927f670aeca22c SHA-256: 4e032cfd306827314bdc4c10d37e06d6c38f5ac522937712cefc6d54fbd5968c
146 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of phishing and callback lures. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The document's structure and embedded links align with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://baarspo.ru/wb?keyword=modern%20abc%20biology%20book%20pdf PDF link annotation
    • http://efarbok.xyz/giruxapewapudum01ouv.pdfIn PDF document text
    • https://pudupujaw.weebly.com/uploads/1/3/0/8/130813100/5565171.pdfIn PDF document text
    • http://service-hire.com/aion_bard_guide_pveue8aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_6019383cbfc26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5fcb76887913b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_60250a0730848.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/67efff678.pdfIn PDF document text
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/0ebdfa7febb562c.pdfIn PDF document text
    • http://reactivascotia2020.com/denuterejaviwereluwufokulfr7ty.pdfIn PDF document text
    • http://ellmax-site.xyz/florida_foreign_corporation_annual_reporta8e6s.pdfIn PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/f2983103.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rivowotow.epizy.com/free_alphabet_writing_worksheets_for_kindergarten.pdfIn PDF document text
    • http://boxitevu.rf.gd/83500862109.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC21 5456 bytes
SHA-256: 76ff07c03db725ad2cf49538a1fbd3512d56bfc4e784926be7ffcd9e579f9c00
font_01_sfnt_off0000ced7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED7 11612 bytes
SHA-256: 1d438867cff3d4ed0c1d228dd323d34cc3c374b7a61a9606356131fdf311886c
font_02_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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