Malicious PDF — malware analysis report

Static analysis result for SHA-256 146b5ab4157f0f52…

MALICIOUS

PDF

76.8 KB Created: 2021-03-23 00:11:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 47179454440a85f09168d3a7e9791bbf SHA-1: ec487af335fc9983528f14ce2306633b913747f5 SHA-256: 146b5ab4157f0f52c659df1497769e60969ab2ca0067397e3f377694b835ee10
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of redirects. The document body, though heavily obfuscated, contains text related to search queries, suggesting a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/strik?utm_term=cuanto+milimetros+tiene+una+pulgada PDF link annotation
    • http://alfa-quest.ru/870252692676lp7j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420597/normal_5fcaad2307d91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466175/normal_5fde1b73adf3c.pdfIn PDF document text
    • http://copyrightshelpcenter.com/sheets_of_plastic_lowes7wlep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450158/normal_5fc8c18c56a3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485445/normal_600a18757b461.pdfIn PDF document text
    • http://wiinorama.website/tibotesimobevezuxabo0ifw0.pdfIn PDF document text
    • http://verifiedbadges-form.com/lupaduwalatibg5ydo.pdfIn PDF document text
    • http://peskomment.ru/austin_st_john_pornaupr2.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/jaxPczU/best_wifi_analyzer_app_ios_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/meigFkS/university_of_montana_tuition_waiver.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/zotojedas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_6010efba4812d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_603713138af9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410965/normal_6001bf5720906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475588/normal_60358213d9856.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/SkjLzqG/97717836784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5fdb8fb199fe9.pdfIn PDF document text
    • https://cdn.sqhk.co/vijasezadida/sgegf6c/30319985511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_601733da1bcd8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livirava.atwebpages.com/what_smells_like_vinegar_in_my_car.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/fifimulizokivijesa.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/lopstick_lodge_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/find_the_percentage_change_worksheet.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_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 5184 bytes
SHA-256: 7312ea320159275ff8b4d13445895ceb3de7d984258f16fc03b02b62603010db
font_01_sfnt_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 11244 bytes
SHA-256: f24d771be5b3ba168239ec7a2e113e148f5d3495dd43245ae600989461aa748c

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