Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6d8921ed6cb708…

MALICIOUS

PDF

66.7 KB Created: 2020-12-21 22:28:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 24f7307a774e508e4c0f8ab3f5e54989 SHA-1: e7095c3b8ed34d50db8705bb3919e1c7fbef1ce6 SHA-256: db6d8921ed6cb708c2512d7bafc25df7bfec1f58bd6dff55f9359880e6c35327
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL suggests an attempt to redirect the user to a phishing or malware distribution site, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cctraff.ru/strik?utm_term=3d+model+construction+lego+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_5fbf22a2f3ee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_5fd7aa4687179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_5f957368da892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383138/normal_5fae2fcd1aaa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5f8acb5ce3b15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_5fdc4f802a32a.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/fee7c37f-7b91-4e8f-a36a-53c94fa2275b/smiths_grocery_store_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1554b0-9220-443d-8d19-2edf1c5a4f88/80981666131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b680e721-1250-4d0b-8512-cac6420e2e20/gartner_managed_security_services_magic_quadrant_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e3b4534-81ac-4302-9676-cb18bff34c22/10477594148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b779bd-2e2d-4b62-b108-f39e0a3c0725/the_magicians_land.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/tilurevetaruxera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8697b2d2-1051-4a31-805d-963af3a224aa/44662006203.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_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 5200 bytes
SHA-256: 2659230503b9d0ddf1757a5fd216b96f6c8ec77da367f4cd038ac1d2192cc6e4
font_01_sfnt_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 10628 bytes
SHA-256: a89ad279ac51fa070d82b78658c70ac18858dd4d2133a41b72194f20f1283bb6

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