Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfee9c5e67fa7e8a…

MALICIOUS

PDF

69.5 KB Created: 2020-11-14 14:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08f15af28a323b7612b4bf554ab79b23 SHA-1: d013bb28c806d4d25c8a4b208b4c67f3e0f60235 SHA-256: cfee9c5e67fa7e8a1b3bd555186720867387c8cb48cfd4a32eea9a124978fd6c
214 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Stihl chainsaw manuals', suggesting a lure to entice users to click the malicious link. The presence of multiple PDF links and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=stihl+chainsaw+manuals
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f8d367f5cc41.pdf
    • https://jarofudi.weebly.com/uploads/1/3/1/4/131408364/mulaxirepaluj.pdf
    • https://cdn-cms.f-static.net/uploads/4472491/normal_5fa44cb06c474.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/waxapoz/93310343587.pdf
    • https://s3.amazonaws.com/vifusupegiza/benuguxuwebetebogatigidu.pdf
    • https://uploads.strikinglycdn.com/files/3dc58c1b-2b25-4698-9fa2-ccc3e7e668b4/tigebulazilewilut.pdf
    • https://uploads.strikinglycdn.com/files/c92db935-fb60-4a0b-8570-a1d805716181/23665593269.pdf
    • https://s3.amazonaws.com/mexesazaxasa/95131644171.pdf
    • https://s3.amazonaws.com/sefepugolupalax/8613078268.pdf
    • https://s3.amazonaws.com/pexodugosa/importance_of_teaching_critical_thinking_skills_in_the_classroom.pdf
    • https://uploads.strikinglycdn.com/files/7dd8c6dd-5b3d-43b0-a585-22549ec4f0d6/girls_christmas_dresses_size_12.pdf
    • https://uploads.strikinglycdn.com/files/f84b00ff-a632-4b07-8f15-aac2d8edd680/19748818873.pdf
    • https://uploads.strikinglycdn.com/files/bf9078d7-a720-426c-9fb9-0caa0fb36930/wutufuxejusuzujex.pdf
    • https://s3.amazonaws.com/rokuwapesu/xingbao_building_sets.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1b4.bin
de59f9f0ba9b85d2c6d63bf099c0a9f09bae7b196b2347aa32e1fbbae7db58b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 5136 bytes
font_01_sfnt_off0000e31b.bin
1cc5db4abc05bcebb75f74679493dcdb9c296849fd31aafed5166b5fb22b6a21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 11192 bytes

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