Malicious PDF — malware analysis report

Static analysis result for SHA-256 a933a51559e732bb…

MALICIOUS

PDF

69.3 KB Created: 2021-02-06 06:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2f95d5a2acd6e0972f907030a6b25740 SHA-1: 1f1bd8f523be7a6106bb31396429e749f255cbdf SHA-256: a933a51559e732bbf5ad129c0eb8aab8d6098e8ab33188f90771cffb239b1858
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure designed to host many links on low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=growing+tomatoes+in+tampa+florida PDF link annotation
    • http://vujukotigenali.22web.org/script_html_template_web.pdfIn PDF document text
    • http://cardio-active.site/vajutotaxgm9im.pdfIn PDF document text
    • http://ca-manalapan.space/gumefuganiwuzidea2h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369659/normal_5fe208fb68629.pdfIn PDF document text
    • http://lepegumokolato.iblogger.org/22936083572.pdfIn PDF document text
    • http://esportzmlevent.com/berariponokrnlji.pdfIn PDF document text
    • http://greenbike.shop/air_control_systems_monmouth_oregon9tky9.pdfIn PDF document text
    • http://parralax.net/pupen5izaf.pdfIn PDF document text
    • http://pek-24.cc/the_minto_pyramid_principle12smb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481423/normal_5fe6ec4416d84.pdfIn PDF document text
    • http://bitipusefotas.66ghz.com/tujititibib.pdfIn PDF document text
    • http://rukozhop-guide.com/6384363299qmazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://boripodadup.epizy.com/bibaho_obhijaan_trailer.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_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 5484 bytes
SHA-256: 5943405537c79fafd2bb8078d1730e279ca6c7938568e8643b4ebb965caecede
font_01_sfnt_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 11204 bytes
SHA-256: 44094befb0d0e7fb755f3eff4e22a3ffe0c5a80de1e4e891c5d25b57ffbd1635

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