Malicious PDF — malware analysis report

Static analysis result for SHA-256 d236f5f4da99c68b…

MALICIOUS

PDF

74.2 KB Created: 2021-02-17 05:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b163eb525cab73cf769b9c2e8b591948 SHA-1: 7e5c039486bbd6625bd389e43249167bc788193c SHA-256: d236f5f4da99c68b58b69703f34ca155f5300a311ffb82ff41e07795c0a3c82d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=craftsman+kohler+pro+26+hp+v-twin+oil+type PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5fd2531c86044.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369508/normal_5fe4346779206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_5fd835b6a7232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_5fd9b3f5b0ef5.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/porezorupadunu-xawokofuke-mesugopunegil.pdfIn PDF document text
    • https://kazumole.weebly.com/uploads/1/3/1/4/131454435/1675862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_6027e620b3af7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_5fd84fe7a5814.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/xVsjbhc/63526917650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5fe7747648e0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460682/normal_5fef58a3dbf82.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/aNso5KI/fugusugagifivama.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/Thjghie/strategy_pattern_angular_typescript.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/frLoWid/red_ball_4_volume_5_into_the_caves.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://loratozojakin.epizy.com/guweso.pdfIn PDF document text
    • http://pitowexenijodez.rf.gd/80438273633.pdfIn PDF document text
    • http://kugefosames.rf.gd/panama_city_news_herald_reporters.pdfIn PDF document text
    • http://goseletew.epizy.com/bidepe.pdfIn PDF document text
    • http://mujunuge.rf.gd/bookmania_font_family_free.pdfIn PDF document text
    • http://vovijez.epizy.com/amorepacific_group_annual_report.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_off0000e075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 5684 bytes
SHA-256: 48d5437f532e7f8658487e9f2d02c52e1621958f908d9ad4cedad32534cae408
font_01_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 11540 bytes
SHA-256: a333a603d31ac4f8e79b1c63b6d816c93acec7ac355e9fbcb8bb8dc400ec046b

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