Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4deb40c341eac79…

MALICIOUS

PDF

63.5 KB Created: 2020-11-12 23:14:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4007a0b78885b923ea21b55ec9355b1f SHA-1: 15dad381645032d4ca82b70629cf1bc0fa88858b SHA-256: c4deb40c341eac7924f2ea5d4218dd45e51ed6f7c83562badb41d21f2acde446
154 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 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 4

  • 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.
  • 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://ggtraff.ru/strik?utm_term=fundamentos+de+hematologia+ruiz+arguelles In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f87edd368ff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5fa8e374b687e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5fa92021d047e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_5f944676e8d4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5faaa486a5e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5fab864a7e8e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f8a70c921263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_5f8e97b631be3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_5f92a6c3b158a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f8d35b207650.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/9b3b06a5-a91e-4aa7-90b4-bb33dc4353bc/57116685248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dcd6e27-241f-4564-91d3-16f74abc3f28/36354977439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9026e34-acb9-4c6c-86df-1efcf65d0d3a/nedofigijuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed451f3-8518-4860-a6c9-2b01484f9814/baditu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59af8eb5-4058-42b6-a9aa-17993d53969d/rubasuluvubabusuv.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_off0000b9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E8 5244 bytes
SHA-256: 266b28dd23bccdea474b5a665f5e598559d2e3c1379b7406a5973941d26a757e
font_01_sfnt_off0000cb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9A 11060 bytes
SHA-256: e7813eca623d16909dc875a273160b678e279bc5115d9e066a2964050b77c0ea

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