Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b45b80b1d03b68…

MALICIOUS

PDF

74.5 KB Created: 2021-02-06 18:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 35a781076493c9ab1514104c6e666061 SHA-1: 78690fa59e7b592feb3c1323dd8239f90e0d6c1c SHA-256: d2b45b80b1d03b680adfdc4944b3a6d1c73b799d578c4b82ae54f4efe8176885
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that lead to suspicious domains, many of which are disguised as PDF downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://bologen.ru/123?utm_term=yevo+43+essential+nutrients PDF link annotation
    • http://about-fb-support.com/download_keith_sweat_albumfjblq.pdfIn PDF document text
    • http://gsmall.space/489322410375isbf.pdfIn PDF document text
    • http://zaliv2k20wowowowoow.xyz/36819603041a9tiw.pdfIn PDF document text
    • http://1xbet-registr.site/dm_starter_kit7wa1d.pdfIn PDF document text
    • http://atomlinux.com/google_account_manager_apk_9.0exed4.pdfIn PDF document text
    • http://zaliv2k20wowowowoow.xyz/jegirepiself3290.pdfIn PDF document text
    • http://1eyvgo.xyz/ribuwosg7b.pdfIn PDF document text
    • http://file-id.ru/47127736344146gp.pdfIn PDF document text
    • http://kigurumi.org/zativatozovimexafuwobug3qxva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412895/normal_5ff5f2e7e91c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_6012a38d94723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_5fd308aee4a68.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_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 4952 bytes
SHA-256: a543d2588d074f864693b8e4ec96aac0c3c7bb5b3f675fc8bb640be5472bd264
font_01_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 11696 bytes
SHA-256: 3eb1f44cbeb9ea7c97db182dde38b9783338ece980a5111276cef1e58507250c

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