Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02ade5a30c79c1c…

MALICIOUS

PDF

76.0 KB Created: 2021-02-27 08:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1ba73dff27b66875f6804e1272e52487 SHA-1: 58d8b872a68cbf6bdbb7c134dfc96192f1459c67 SHA-256: a02ade5a30c79c1cd3572266ad174007360e860595a4de24122a533dfd828250
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URIs, with one specifically pointing to 'leonvi.ru', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, commonly used to obscure malicious destinations.

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://leonvi.ru/aws?utm_term=rx+v377+specs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383340/normal_6039e29e624bb.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/97237279869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491169/normal_5fdd3143525a8.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/kodajemesafixiwukipokiz.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/the_lord_of_the_rings_in_hindi_filmyzilla.pdfIn PDF document text
    • https://vususutuf.weebly.com/uploads/1/3/4/6/134634118/4256644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_601d780528a84.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/black_and_decker_easy_steam_iron_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404122/normal_600b8d2da9116.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/54859491116.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/pioneer_vsx-524_service_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491926/normal_602c3ddf72bd9.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/gosete/konawazusu.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/45211868446.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/kapanutib.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/13261890490.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/bajamilagomevudoninaxi.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_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 4968 bytes
SHA-256: ae752e3929cd0b611cd083cd7e4e783a6b2f875803ceee30c9796fc65e2da352
font_01_sfnt_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 11400 bytes
SHA-256: d8218ee79a8a7154c7a36ffc621dee20d413a7d63bc6824e2cc20ae494affe84

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