Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa288e400a86540a…

MALICIOUS

PDF

68.0 KB Created: 2021-02-24 19:54:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 817ce155508f4474d2369b2431796139 SHA-1: da0438435a05978338baf944b1b11f42ff6d9565 SHA-256: fa288e400a86540a622c86e01e86907a0dfb6040f8ea374f8b74144e858e76ef
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially malicious websites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or scam campaign.

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://jacksth.ru/wix?keyword=super+cleanup+karel+code PDF link annotation
    • https://cdn.sqhk.co/munuluxel/8xmjzDK/star_wars_a_new_hope_opening_crawl_script.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_5fe64d3ebb9c0.pdfIn PDF document text
    • http://fufibubesex.iblogger.org/granny_pc_igg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_60334650eee03.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/is_sat_required_for_class_of_2022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449768/normal_6015fee59e2ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448096/normal_5ffd0a9240aa1.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/cNfjggC/401034475.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/32095356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383692/normal_5ff8a442aedaf.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/descargar_audio_biblia_reina_valera_1960_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/febutatesu/FgcOSW2/36169977267.pdfIn PDF document text
    • http://sanadewa.iblogger.org/credit_report_dispute_online_or._mail.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/VOlu6U9/96248004126.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nukalisunu.rf.gd/80000160554.pdfIn PDF document text
    • http://duvodix.myartsonline.com/lobifojijo.pdfIn PDF document text
    • http://navenogu.rf.gd/cambiar_ip_manualmente_windows_7.pdfIn PDF document text
    • http://delezomixotu.epizy.com/32616239309.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_off0000cfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCC 5056 bytes
SHA-256: 926cbcd5fd43424a1c9e179ac68b8b713bde88768aaf2f339a27a6c6d63a7162
font_01_sfnt_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 9956 bytes
SHA-256: a1fec9906a387f83b97b5ac65acebe29b83ef82887cf7284d20f91b46447ba18

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