Malicious PDF — malware analysis report

Static analysis result for SHA-256 8263228e10332a47…

MALICIOUS

PDF

64.8 KB Created: 2020-11-18 13:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fee1133b008c0b82c7f192a804a9bf3 SHA-1: 1740b8ed5fc0b180943a223c4edfe9330da2ea8f SHA-256: 8263228e10332a4775a6dd0e7192fcb8769238775179d6765856aae8e713e924
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, likely for SEO manipulation or to redirect users to malicious sites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?utm_term=healthy+crossword+puzzle+answer
    • https://matoxidatu.weebly.com/uploads/1/3/4/6/134602194/vomabeluxapimu.pdf
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5f999882a4384.pdf
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/dilupirewajix-firadi.pdf
    • https://lirebuzufosol.weebly.com/uploads/1/3/1/4/131453665/791bf9d83063e8.pdf
    • https://nixoferijoxe.weebly.com/uploads/1/3/4/3/134373865/molovan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sutawowirosuvuv/laravel_send_mail_with_template.pdf
    • https://s3.amazonaws.com/davubewu/ucla_math_31a.pdf
    • https://s3.amazonaws.com/nezanurugega/45359556187.pdf
    • https://s3.amazonaws.com/wumodukubaru/rudivajawelavesane.pdf
    • https://s3.amazonaws.com/zufojadibi/siropobuwumatuguvore.pdf
    • https://s3.amazonaws.com/lanorolowu/ropixemipomifig.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_off0000c0f2.bin
da78ac90252a0d6d5b09bfa1f17f184de1ccd58e41fd3c964c8ef34090474958		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F2 5364 bytes
font_01_sfnt_off0000d348.bin
dc39066555d612d21584bee6b7f3740b26b1dbb5c9663889ec9a0912d2b555d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 10352 bytes

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