Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a63b9c4af10ec3…

MALICIOUS

PDF

75.8 KB Created: 2021-02-25 20:09:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f4fef3e2236129d366ba85f340ca481c SHA-1: ec8bcb8eefeba23a720485e6d35a614294864a51 SHA-256: a6a63b9c4af10ec3b4163358e5ed73fd71cc7cd03f91568879043c6f31fb17ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful content. The presence of multiple external URLs points towards a phishing or malware distribution scheme.

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 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://maypoin.ru/award?keyword=hr54-200+vs+hr54-500 PDF link annotation
    • http://roxelejabojafe.scienceontheweb.net/how_to_change_installer_code_dsc_impassa.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/6ghdmij/cafetaria_marco_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/gLeRPha/turub.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/hdghegi/xosekixikuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446761/normal_6035db2d3b679.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/77303859240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461516/normal_5fcda28f33d78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479222/normal_5ffc71e7778ff.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/hja1Agi/fibavinebifatolob.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/wazotojemov/87310480914.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/kowitomizorufojotuv.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/95281179412.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/78456636153.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/bangladeshi_passport_online_application_form.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_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 5068 bytes
SHA-256: 19867e9b3c7df72af433b610ebec0258f70d101ca34c8124df4fa9f9236813c8
font_01_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 10704 bytes
SHA-256: 1543fea1270d9ff969b69e3f881ee0320ea6a4c3d96001fcdb6fbe95ac11a4fe

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