Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1d6b633d17f027…

MALICIOUS

PDF

85.0 KB Created: 2021-04-08 00:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bbcca2bb74a29c9e3ff8bd5cea43af5 SHA-1: 2477f9ed74c7ce6276b21ae0cff1249de8336ece SHA-256: 8f1d6b633d17f027c70baf7f297a0a2a2b91d13d43f9fdb7551bedeb87c131f1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'crophysi.ru' and a query parameter suggesting a poem anthology. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware.

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://crophysi.ru/123?utm_term=antolog%25C3%25ADa+de+poemas+pdf
    • https://cdn-cms.f-static.net/uploads/4501374/normal_5fe99d0d1a9fe.pdf
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/908aed5d.pdf
    • http://excellent-spb.ru/57759647155dylwr.pdf
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/01ef7ee6ed.pdf
    • http://zoosalon.org/dishonored_2_emily_powers_guidexbc7b.pdf
    • https://cdn.sqhk.co/nabotogemobe/40JihCW/wedogevanisazaxe.pdf
    • https://cdn.sqhk.co/fotenulutis/jbdjbjh/sazukogibewamibovan.pdf
    • http://tofabukusakuni.22web.org/free_arabic_number_fonts.pdf
    • https://cdn-cms.f-static.net/uploads/4413590/normal_6012093410684.pdf
    • https://fuxopejebema.weebly.com/uploads/1/3/4/0/134018858/wagisawuguxomixuzow.pdf
    • https://cdn.sqhk.co/wuzevunoxina/b0tWrgc/badifokalexuvuboxafike.pdf
    • https://bamebifubakuta.weebly.com/uploads/1/3/1/4/131408159/1886774.pdf
    • https://cdn.sqhk.co/takejirasomu/jiKaAge/spotlight_room_escape_losung_underground.pdf
    • http://microbladingcertificationdfw.org/girls_frontline_glitch_landnkkmv.pdf
    • https://dovewonarada.weebly.com/uploads/1/3/4/6/134672256/cf2786899b1b4c.pdf
    • http://logvoz.ru/rirelekisepuguq0ldj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vanakodezifezuv.epizy.com/rolling_bags_for_court_reporters.pdf
    • https://s3.amazonaws.com/lorerexeg/smart_band_watch_price_in_bangladesh.pdf
    • https://s3.amazonaws.com/potofaw/collective_nouns_worksheets.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010be5.bin
0df5d17ff55f0ce540f01c96ca77ff4a06c194b90c41070d35226ebda321280b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE5 5308 bytes
font_01_sfnt_off00011df0.bin
4a79d187bc2a33930dcda8c08a1c4002faa760ff66e0c1a48b28f5387f7d9d3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 12224 bytes

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