Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c7a6046e58fac9…

MALICIOUS

PDF

76.3 KB Created: 2021-02-24 11:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: bd99d9806868d7677625f08d4d0f235b SHA-1: 4c7d8f4038163bd8e6f575f8b0612393c7816fd8 SHA-256: 31c7a6046e58fac915c2cd98bad4d4f08b9179b00b822b34eb66c5f8c83850e0
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. One prominent URL, 'https://maypoin.ru/strik?utm_term=como+hacer+un+bosquejo+para+un+ensayo', is directly associated with the document's apparent theme of essay outlining. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via 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/strik?utm_term=como+hacer+un+bosquejo+para+un+ensayo PDF link annotation
    • https://cdn.sqhk.co/sebetite/4yTggOH/kavazivipas.pdfIn PDF document text
    • http://radapox.iblogger.org/fewojugufefen.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/bDIhjjh/cracked_ipad_screen_prank_app.pdfIn PDF document text
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/bazarejefofag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_602f347c29224.pdfIn PDF document text
    • https://virixodebusetij.weebly.com/uploads/1/3/1/3/131383575/7931f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480736/normal_5fd0895885ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413346/normal_5fdc75ac8ee4c.pdfIn PDF document text
    • http://guzowomofe.iblogger.org/bajabimonugufotad.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/jbighhr/my_first_words_book_big_w.pdfIn PDF document text
    • http://gitixitevusud.22web.org/22733778573.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowanesivokadeb.rf.gd/canonical_transformation_in_classical_mechanics_problems.pdfIn PDF document text
    • http://lumigetutiburu.epizy.com/92225552751.pdfIn PDF document text
    • http://jadupapobixe.epizy.com/9211517986.pdfIn PDF document text
    • http://wudafozejuniv.rf.gd/54822971760.pdfIn PDF document text
    • http://lesiterifok.epizy.com/proxy_browser_apk_free.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_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 5492 bytes
SHA-256: 4a0d23822011d525be32c8a9b8bb0652184b03963d0f0d236a06dcbc4097eb7b
font_01_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 11524 bytes
SHA-256: 73a0c1cb5f2024a1e21db42181c3f68b4f57a30c77ef0d65a0a93f5cec36c87d

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