Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8c0cd720062927…

MALICIOUS

PDF

151.3 KB Created: 2020-11-17 08:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 44e8f4048cad99adc4a387013036993e SHA-1: 5bb7ca98680d976c7fd49a1dd60419be17509d6f SHA-256: cb8c0cd7200629276e74450a14b8fadf90d40c28e2d9fcbdbe8449b230e6885e
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 0.9992

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://gettraff.ru/strik?utm_term=l%2527interpr%25C3%25A9tation+des+maladies+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5fa7be310f3ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5f8f4b68b843a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_5f95f8bf1415a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5f9beb331f4fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f896e8511363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419413/normal_5fb33fe9866f3.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/9354f64c-55f1-4edd-87e4-2ad977459e57/subnautica_how_to_use_alien_containment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8bb937-e7f2-457d-9fb8-306bde97413f/88600530119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad2b255b-5ec7-4c9c-92dd-67fda0186830/99115246464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f840fa3a-983c-4c77-82ba-bb47865ab18c/zujefas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa10251a-7a40-46c9-8ef3-8555fc688677/mosoxutugemipa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE78 5304 bytes
SHA-256: a087750bac6c715caa28b78e5a4d99618a2de490a45b540c0a35a955aa87ee65
font_01_sfnt_off00021030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21030 13268 bytes
SHA-256: fe3d911c401421243a2f2d6cb7a2bfc19a066bf9c6d338915188e97922a61a79
font_02_sfnt_off0002398e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2398E 16060 bytes
SHA-256: d78d7cc1a68daa951b4fbccbcfb906d5a08ad384f187125596154666a45abe72

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