Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fdd9351593d967…

MALICIOUS

PDF

74.1 KB Created: 2021-03-02 22:32:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ece2f09dc7c98134baf7d48ca05e2194 SHA-1: 4ec972c590803220d1f6fd8689076307d95295a9 SHA-256: d8fdd9351593d9676d3f07f481b83b3894dfb75e2392f39ff3b9921063629569
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 for 'Pdf.Phishing.Trojan'. The presence of numerous embedded links, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The ML classifier also returned a high confidence score for maliciousness.

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://resalured.ru/123?utm_term=best+rzr+xp+1000+axles PDF link annotation
    • https://fuwofinirofen.weebly.com/uploads/1/3/1/6/131637723/2774374.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/jdwxggH/live_video_chat_app_mod_apk_unlimited_coins.pdfIn PDF document text
    • http://wogaxuma.22web.org/belling_double_oven_user_manual.pdfIn PDF document text
    • https://rabidibizuzej.weebly.com/uploads/1/3/4/6/134648686/5812987.pdfIn PDF document text
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/kokuvepufiwerivap.pdfIn PDF document text
    • https://fubuwadedaxas.weebly.com/uploads/1/3/4/8/134897716/ead3975687.pdfIn PDF document text
    • http://tobalalupuvobiv.iblogger.org/how_to_fix_conair_hair_clippers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xigufogadenake.epizy.com/security_clearance_adjudicative_guidelines_opm.pdfIn PDF document text
    • http://befokube.rf.gd/26808970636.pdfIn PDF document text
    • http://dokelegusipodi.epizy.com/93150618417.pdfIn PDF document text
    • http://nodafawujanego.rf.gd/date_format_php_am_pm.pdfIn PDF document text
    • http://mefowoweman.epizy.com/jelew.pdfIn PDF document text
    • http://tovezujatim.rf.gd/75791337945.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_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 5172 bytes
SHA-256: 85e97cf1bf05fdf2b750a4f4c97c0e45d267272dc6a664a243cf4c95b9778294
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 11152 bytes
SHA-256: c148187f4d68195f56dc61ebd267c3765eb91a909bf21df08f30beb643696712

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