Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3dd59a6d33ab173…

MALICIOUS

PDF

89.2 KB Created: 2021-02-16 18:40:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2b3e1b37dc3242463e131272bda28e3e SHA-1: 46ba73ea2d8aae05d6ff1f23e62547981be6a305 SHA-256: c3dd59a6d33ab1730fa4190ec026d9a608790818696982dc0684e32c2d6da133
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically appearing as a search result for an audiobook, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of multiple external links and the heuristic identifying a link farm on disposable hosting point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=christopher+vogler+the+writer%2527s+journey+audiobook PDF link annotation
    • http://zerkalo-fugicar.website/dnd_5e_ballista_ruleskpvqf.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/ihjjluo/laxumes.pdfIn PDF document text
    • https://mipigonegomef.weebly.com/uploads/1/3/0/8/130813466/7766903.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/cjgHUH5/2020_high_school_football_rankings_espn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5fd94942b19aa.pdfIn PDF document text
    • http://huaweistoreukr.xyz/53597094197j3bv1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465685/normal_5fee98d4d9b65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://butaxogusevi.epizy.com/dual_antiplatelet_therapy_guideline.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/berlin_station_season_3_episode_4.pdfIn PDF document text
    • http://nolepukopele.epizy.com/tefela.pdfIn PDF document text
    • http://sonasekofuxix.rf.gd/american_war_movies_2018.pdfIn PDF document text
    • http://gusutawidike.epizy.com/correcting_grammar_worksheets.pdfIn PDF document text
    • http://sojetabusat.rf.gd/chain_reaction_movie_free.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/kekalamaxebozilitanuzezip.pdfIn PDF document text
    • http://xaralitotido.rf.gd/guidelines_epo_ranges.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_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 5696 bytes
SHA-256: 4e15caafff58e3db10f6ca424a3813efdc8ab40805cd7583b73bb99055e6910c
font_01_sfnt_off0001300b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300B 11644 bytes
SHA-256: d376308539d03e7af80a2f9ea924438d95672b28d245cf1b00031db318ffe252

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