Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2571981fc3eb80f…

MALICIOUS

PDF

71.8 KB Created: 2021-03-28 04:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1295468e5fa7e1fb784601e46d562056 SHA-1: 8edeb995de9a8a137316c58505ecda15e756ed2d SHA-256: c2571981fc3eb80f379199f8becfec9ecce209e11efac6d64bcd6c18646b55bb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness. The presence of external URIs and the link farm structure suggest an attempt to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://zajinet.ru/strik?utm_term=how+to+use+avaya+one+x+communicator PDF link annotation
    • https://cdn.sqhk.co/ranetixeba/ZOhaaWa/formula_1_2020_standings.pdfIn PDF document text
    • https://cdn.sqhk.co/vutowogipu/ShaGgec/traffic_accident_near_me_yesterday.pdfIn PDF document text
    • https://cdn.sqhk.co/zidenesek/LwhfbVm/87565159936.pdfIn PDF document text
    • http://nudistoff.club/detaxilaxaluputawudipufh8sn.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/3hbzUhc/47772804856.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5ff82f8f5c4da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444877/normal_604a131d8e66b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482617/normal_6045f859f2db5.pdfIn PDF document text
    • https://cdn.sqhk.co/kixikeli/oPL0X9N/financial_analyst_roles_and_responsibilities.pdfIn PDF document text
    • http://loveantravel.xyz/rare_blood_disorders_list5se55.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/Qhh8qsl/46838367681.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/jcQ3cjh/tuvesesenafusasexusike.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402710/normal_60001f5ea1e05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5ff979002f8be.pdfIn PDF document text
    • http://wisitens.online/74494006907348fy.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
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_3d69f395ab5c48cea62d59786d894032.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_472f3f32eab741fdb2a493df5b5cfc7f.pdf?index=trueIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_d6b5aa4dc0c440f0a629ca3ad8064500.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_e36be257247e49a49e0bfa1ef9de1339.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_3e0bfc2465424738b36cc81dd9d5e095.pdf?index=trueIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_54985a0087d2426b80897a51ffe5e495.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_4a4b738d71ee4a85afffa6ed150443d9.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA3 5080 bytes
SHA-256: 1000e3fc98a5e694b7fc784a71452753646c2825191db2ff7920d1195e3c049f
font_01_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 10004 bytes
SHA-256: 6f51ad160d41d209d2e7b4e129ebd843f347282b76fccc88cf8031237c0b58ca
font_02_sfnt_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3