Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf914c8929d2e275…

MALICIOUS

PDF

112.4 KB Created: 2021-02-13 16:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: afc9b6b611ccc03da0d7b8514a702f74 SHA-1: 5182538db3d856bd9a9dca4a4bded92ae51ab253 SHA-256: cf914c8929d2e275ceebec9fcf8eed9d6bbab7479ff3444e6d736f9f891a6b17
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or spam distribution scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://seumenha.ru/wb?keyword=biaxial%20deformation%20definition PDF link annotation
    • https://cdn.sqhk.co/vakanaju/EjfSzzc/electric_train_collectors_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451374/normal_5fde82713c1eb.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/WGhjtic/33441999882.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/jjfWheb/19803451246.pdfIn PDF document text
    • https://cdn.sqhk.co/zeliravepuj/dDhjwhf/chest_simulator_for_cr_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/teruzakuvebeji.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/cast_shadow._psd.pdfIn PDF document text
    • http://vikaviruvumuz.epizy.com/adverbs_adjectives_worksheet_3rd_grade.pdfIn PDF document text
    • http://mafolizol.rf.gd/8128739882.pdfIn PDF document text
    • http://zimogaz.epizy.com/math_accelerated_chapter_1_answers.pdfIn PDF document text
    • http://deketinak.rf.gd/4553987899.pdfIn PDF document text
    • http://kunaraxanoxun.epizy.com/kazixetevuz.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/vaviner.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/56707017712.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/armitron_watch_manual_pro_sport.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C9D 2868 bytes
SHA-256: b41bea1b6452f752dbfebed22a84b2b90fbc40f7202eadc28c3945cc57bd146b
font_01_sfnt_off000176d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D0 4992 bytes
SHA-256: 8c4a544b3326ec686ec443912bc39a785df7a9bf17141b2eb21983d03342ec1d
font_02_sfnt_off000187bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187BC 13472 bytes
SHA-256: 43ca079c3e6a665e7cfe0239da61b915773c3737a42e435ebff8c6f2e9292007

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