Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e089a7ccb7933f…

MALICIOUS

PDF

94.7 KB Created: 2021-03-18 08:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f52aba15a02c08832a136b49c856a7b8 SHA-1: 7d1dc7adf26efff6406de516e50e7548bb374660 SHA-256: f0e089a7ccb7933f848c79dcf455d9898df0550cc35dcf160d1a2f9d63764968
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, potentially indicating its generation method and time. The presence of external URIs and the overall structure strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=eu+whistleblowing+directive+2020+pdf
    • https://jabenawonidibe.weebly.com/uploads/1/3/5/3/135385032/eaed9431dd.pdf
    • https://static.s123-cdn-static.com/uploads/4401518/normal_5ffeff0992770.pdf
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/telubidiruwu.pdf
    • https://cdn.sqhk.co/wazikunal/baqMrgh/38782597247.pdf
    • https://cdn-cms.f-static.net/uploads/4448995/normal_6028e66e959aa.pdf
    • https://cdn.sqhk.co/xeviremal/gfjhuPV/cisco_finesse_11._6_api_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4366302/normal_601066bba6d84.pdf
    • https://static.s123-cdn-static.com/uploads/4482854/normal_60009faf3ff3b.pdf
    • https://static.s123-cdn-static.com/uploads/4475204/normal_5fe4981b0411b.pdf
    • https://cdn-cms.f-static.net/uploads/4454543/normal_60112a31ebcbb.pdf
    • https://static.s123-cdn-static.com/uploads/4390071/normal_5fe58a3f5b94e.pdf
    • http://bumosid.getenjoyment.net/calendario_2020_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4423171/normal_6026536758152.pdf
    • https://cdn.sqhk.co/tamoravuwera/gPgdje4/matalite.pdf
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/lizewowamep_napisuwojugodo_zuditi_mewudemiwaja.pdf
    • https://cdn.sqhk.co/lewatesudo/hjATWwY/62927362795.pdf
    • http://gipovasota.sportsontheweb.net/jiparudewevawinemozezoga.pdf
    • https://cdn-cms.f-static.net/uploads/4415322/normal_601bb2babb9bc.pdf
    • https://cdn-cms.f-static.net/uploads/4465388/normal_603140ed98361.pdf
    • https://cdn.sqhk.co/linidivez/agdicgh/oreo_ice_cream_cake_recipe_uk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00013411.bin
0b08c0443143ef82be8c48e8a997a9e0933db9b3aa3eca4dc545c4f297f00c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13411 5732 bytes
font_01_sfnt_off000147ac.bin
f58f6ed14ace5cc684a5cabdbf9f41462c647564d57655884c7b8a6f6637a643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147AC 11112 bytes

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