Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b81f0e6fa6f60f…

MALICIOUS

PDF

66.5 KB Created: 2020-12-05 04:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5e53850279b31d95da0ed35aaa0d91dd SHA-1: b11ba18e807914275d93c06d8aecf90d25cfee85 SHA-256: 08b81f0e6fa6f60f4eabaf006d6819be5463af15430d3b02cbb5e91f5b1aa13e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector pointing to 'https://gettraff.ru/strik?utm_term=robe+of+needles'. Another heuristic indicates a PDF link farm, with the first URL being 'https://s3.amazonaws.com/megelugik/zulaforez.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://gettraff.ru/strik?utm_term=robe+of+needles In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464852/normal_5fb035b4649b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_5fb4b22bd9612.pdfIn PDF document text
    • https://lafofawevomu.weebly.com/uploads/1/3/4/7/134770087/9893659.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/vatunomawuwog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_5fbd0e203b0bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369916/normal_5fc52ed64445a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5f917b03d7a95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megelugik/zulaforez.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/ccna_v6_chapter_6_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/33999102216.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_off0000b279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB279 4740 bytes
SHA-256: 9844f21a78a5c4b720f882caad41ec2c762004b159d3008510c65604b194bd93
font_01_sfnt_off0000c2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B4 10948 bytes
SHA-256: ce515ba8260411124def22350c7b1b7645015635e8d0854f1164172df14fc728
font_02_sfnt_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 16060 bytes
SHA-256: 5bd88bd5c44eb894b151ed33ba27cda91e6b534aa93a3b288c9f525c64baf622

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