Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9df6f5f1d151b39…

MALICIOUS

PDF

83.5 KB Created: 2021-01-06 05:50:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a8ab164c2b35de218ae13879f6eb8b05 SHA-1: 27a17ae1f3c53e20b05044a844d6d28e30e87836 SHA-256: c9df6f5f1d151b39b4b243152402bc8eeff94d2e409d0ec26cc950122145d257
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=blow+off+valve+sound In PDF document text
    • https://derivasip.weebly.com/uploads/1/3/1/4/131407068/7653124.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/bikiwufirol-fubub-wozonepuven.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/VjaT6id/79986711675.pdfIn PDF document text
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/a74cfab8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5fb7dbbb43ba5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3740a94-03b9-44a1-a1e9-190ee7458d1a/vovutaxotikuruwuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e672c0a4-3b68-4b8b-9d8e-8e44b93a1f6e/retokilire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66950526-e819-4ef3-9ada-94f44a085727/23028244262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc53eea-3d93-4e79-be0f-908f3d26543e/61219135217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d1e0a8-71b5-4d7d-94b6-de7b66852b0f/diversified_health_occupations_7th_edition_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac5f891-9cd3-4b31-b05f-bb8a9fe48ae8/pokemon_sun_and_moon_post_game_checklist.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_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 5004 bytes
SHA-256: 32ed206a9c48fdb8a5bfd66e4bfb13ba367ed7a780f8302c1ba6a3a04e31f4a4
font_01_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 11084 bytes
SHA-256: 3b691f2a9fc8da6cdcb73c03dcff53b17ea47e13e39dd39f1db877a100094665

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