Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cf3b985dfd6cde…

MALICIOUS

PDF

73.5 KB Created: 2021-02-12 07:01:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1a70a29cd7f3bebd56ec099bfc439b22 SHA-1: 4990c330f1e7ed26cff84913ab64c29b82a32197 SHA-256: 91cf3b985dfd6cde6090cfcaca394fc52cd57c798a57000450a2017ac69ec7e4
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to search terms, aiming to trick users into clicking on these links.

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/wb?keyword=alphabet%20letters%20with%20pictures%20and%20words%20pdf PDF link annotation
    • http://national-verifyteam.com/tnh_ngha_xun_thu_thnh_ngifzb3.pdfIn PDF document text
    • http://cmbclientes.com/woxokikexupe1gl8n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366668/normal_5fde8bd338ff2.pdfIn PDF document text
    • http://instofficial.online/stern_gerlach_experimentjhzsp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422631/normal_5fe997cbc8b6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490365/normal_6025fdb4be877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471682/normal_5fdd44b383de5.pdfIn PDF document text
    • http://innov-cis.net/billy_joel_vienna_piano_sheetknag0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5fd96709dbdd9.pdfIn PDF document text
    • http://bullbananavannaone.xyz/caperucita_roja_y_el_lobo_enamoradopmxpu.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/iaEjehb/evolution_2001_movie_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419623/normal_60038eaa961cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_6013f4637e57c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_6025c0bbc1ef6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484126/normal_5fcddf96f1b87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387814/normal_5fca1b517ccd3.pdfIn PDF document text
    • http://espaceabonne.com/himnario_adventista_powerpointmsgu6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_601dbcbff180a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5fc747dbc987e.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_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 5464 bytes
SHA-256: 15afca0a9519526cd3434bf5893f6a55ab681b89ac5de47aaef353447fc783ed
font_01_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 11816 bytes
SHA-256: b4b4bb02d2956f704c9a7c354ab13b3345dd903f2920a49ec9d6a1591b0713c2

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