Malicious PDF — malware analysis report

Static analysis result for SHA-256 f878306bad0c6c7b…

MALICIOUS

PDF

72.5 KB Created: 2021-02-20 14:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8fef02475ac0e63021bb64697132f6d9 SHA-1: be72043fc92cd9777fb0200e676b9bb49a84ba42 SHA-256: f878306bad0c6c7b1fc414d219ffc51f61f19971bfc6fc0e6f126bfd29881139
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary URLs is 'https://seumenha.ru/wix?keyword=chrome+android+apkmirror', which appears to be a lure. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest it is designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=chrome+android+apkmirror PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387819/normal_60243d5417c66.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/jb0jfFw/99558938207.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/lsQGZgi/tezikogo.pdfIn PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/5057014.pdfIn PDF document text
    • https://vawemuziz.weebly.com/uploads/1/3/5/3/135351027/d96852.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392857/normal_5ff0ba628360d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451208/normal_602a482315606.pdfIn PDF document text
    • https://cdn.sqhk.co/pijavagoke/hcheyv4/crazy_for_speed_2_mod_apk_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/jusitufugaf/Ukpichb/24131892981.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/iW0fifQ/22816401789.pdfIn PDF document text
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/968337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/melametozesul.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/2053682911.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/bajrang_bali_dj_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/3d_custom_anime_girl_creator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/13174533473.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/vidokuwijeju.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/infographics_ppt_template.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/wofotibedosadifebexizol.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/blades_of_time_for_pc.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_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 4960 bytes
SHA-256: d152a139a528c5fbb8ecaa534dc40fe68bf77d54ca667be56c8cede697046045
font_01_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 10160 bytes
SHA-256: 56e30d95fd659cbb092bbe7e78c14d4ea09b3d23291cb78ff98c032d6869dd90

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