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)
MD5: 1295468e5fa7e1fb784601e46d562056 SHA-1: 8edeb995de9a8a137316c58505ecda15e756ed2d SHA-256: c2571981fc3eb80f379199f8becfec9ecce209e11efac6d64bcd6c18646b55bb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique commonly used in SEO link farms and phishing campaigns to redirect users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were extracted, the presence of embedded URLs and the heuristic findings point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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

Files carved from inside the sample during analysis.

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

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