Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f74bd79b2b2d70b…

MALICIOUS

PDF

106.3 KB Created: 2021-05-07 15:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42c474fde59d3baa9314487579d5f9da SHA-1: 1f6a53d1b64277c6cc19bf58e989030b53ad1e9c SHA-256: 5f74bd79b2b2d70b03ed2091021091371582121ad7ec437f74d842b6b7148d7d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, particularly those on disposable hosting and with UTM parameters, strongly suggests a phishing or link-farming attack pattern. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure.

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://seumenha.ru/strik?utm_term=pelonis+oil+filled+heater+smell
    • http://giveaway2020.info/b2_bond_order45d90.pdf
    • https://static.s123-cdn-static.com/uploads/4390383/normal_5fc62eaf2fee4.pdf
    • https://cdn.sqhk.co/rorefevobo/wgeEjdi/giwela.pdf
    • https://cdn-cms.f-static.net/uploads/4455914/normal_6040f2c1691c1.pdf
    • https://cdn-cms.f-static.net/uploads/4428038/normal_600f56f97b37b.pdf
    • https://cdn.sqhk.co/madufuxenuw/2ifgchc/75538051542.pdf
    • http://guditoresuz.22web.org/67110753342.pdf
    • https://cdn.sqhk.co/zururodi/ie1dsfc/ping_pong_kings_vr_download.pdf
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/mowabupele.pdf
    • https://static.s123-cdn-static.com/uploads/4473031/normal_5fe11dda1ddc4.pdf
    • http://firstflirts.site/sig_sauer_357_v_9mm_12464qym.pdf
    • https://datuzela.weebly.com/uploads/1/3/4/1/134109276/befud-giwigude-fudanu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://poziluxolebulu.epizy.com/fimoduwiv.pdf
    • https://s3.amazonaws.com/gezejoputiwinu/bengali_movies_websites_name.pdf
    • http://lomidivu.rf.gd/16873511692.pdf
    • https://s3.amazonaws.com/sabobenuwe/nugizo.pdf
    • https://s3.amazonaws.com/dogazisuze/chemistry_regents_august_2017_answer_key.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_off000163d9.bin
5037ac2bd2eeef4b89eca9665b578aef75f1cda30070e094acef0254dc1964d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x163D9 5148 bytes
font_01_sfnt_off0001752e.bin
89f8f2aaa145732e9f834ccba03212fc334421307a967f3dcfd3c1f3c0d9231f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1752E 11288 bytes

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