Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27077d864425be9…

MALICIOUS

PDF

87.8 KB Created: 2021-02-14 05:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1d23ba53b4c5b13d3fc1ecb02c92fcb4 SHA-1: 423127a3eb29f9e955a2ba754db668a1159c8fe3 SHA-256: d27077d864425be9b7dbfc3b604fdcef9b55ac668b1b0157e113f4917940a601
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, potentially leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/wix?keyword=harvard+summer+institute+on+college+admissions PDF link annotation
    • https://cdn.sqhk.co/wupetutigo/Ejjigz1/54036635386.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/6OZE6ej/movistar_team_shop.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/40ig6hb/98644033494.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476418/normal_5ff2d92dcd634.pdfIn PDF document text
    • http://sobakin.space/wastong_gamit_ng_malaking_titik_worksheets5sa45.pdfIn PDF document text
    • http://nedugitovo.iblogger.org/bajrangbali_ka_pic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5fc9ab505e67f.pdfIn PDF document text
    • http://fapseo.ru/sesuwokapineroliziku9rbyl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_6024c561b0ea3.pdfIn PDF document text
    • http://form-copyrightservices.com/6099806547ilerf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465908/normal_60031ac4ca479.pdfIn PDF document text
    • http://mexicotop3.xyz/cfpb_hmda_getting_it_right_guide81ox7.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/gvRkgjE/pinball_machine_gamestop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465564/normal_60285664e36e4.pdfIn PDF document text
    • http://mandarins.space/gym_fighting_games_bodybuilder_trainer_fight_proyvgt2.pdfIn PDF document text
    • http://sakhavto.ru/gowipejaxeautcj.pdfIn PDF document text
    • http://reassurez-moi-fr.info/29885486212p42kh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_6016e3736bdc5.pdfIn PDF document text
    • http://alifan.store/refesupugofvish.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8E 5280 bytes
SHA-256: ebb8731edb3d54a336616f19eed39670bea292857ded4d87f7d5f7860087278d
font_01_sfnt_off00012e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E72 10196 bytes
SHA-256: dbfa54d96acf1cf0b86ba604b9761d86326b1c7e61216a54b9335b75a1837b55

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