Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2337e04f9a7b00a…

MALICIOUS

PDF

67.0 KB Created: 2021-03-02 17:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 71e4bb1d6e9b4290d754986ec80d8b3f SHA-1: d3a5154effc2f615e77f5ce9491b33c6f2f74244 SHA-256: a2337e04f9a7b00ad3f314f7df65c14c97e0e0ab00190c51c3c11bba35393b63
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to 'zajinet.ru', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the PDF is designed to host multiple links, likely for malicious purposes.

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://zajinet.ru/strik?utm_term=how+to+sync+a+xfinity+remote PDF link annotation
    • http://wumomotetidofe.getenjoyment.net/skyrim_how_to_get_fortify_smithing_enchantment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5fd67d9204cc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_601754ad0a673.pdfIn PDF document text
    • http://tedusoxunola.22web.org/kenmore_elite_electric_oven_manual.pdfIn PDF document text
    • http://vekenuv.iblogger.org/fufivumuwuzoneropag.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/52650291065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498971/normal_602b074d2bf65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_600ae43f92a9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pivimufe.atwebpages.com/jutinexowub.pdfIn PDF document text
    • http://nedilopasosugop.epizy.com/guardian_crossword_15311_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/company_of_heroes_mod_blitzkrieg.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/10104058856.pdfIn PDF document text
    • http://ligujizulogi.atwebpages.com/basic_electronics_engineering_book_download.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_off0000caf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF3 5216 bytes
SHA-256: 1dcb22cb1d458fd4d62cb78106f6bcbd7374af4246237d0133a3d1a92b2d6274
font_01_sfnt_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 10200 bytes
SHA-256: 1432e604bae25c56099495c8d50176f8d555342152d085e52017c5c344b7e0bf

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