Malicious PDF — malware analysis report

Static analysis result for SHA-256 321704d9de89756d…

MALICIOUS

PDF

88.1 KB Created: 2021-04-23 03:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85c41a3cb2745c2d545122a55930789c SHA-1: 67123b7f3a8d75fca77b2a7ddf3deb8f0dc4077c SHA-256: 321704d9de89756d835a1bca643824e5a7515a2a938773f10681732afbe33957
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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://jacksth.ru/strik?utm_term=what+was+congress%2527s+plan+for+reconstruction+quizlet
    • https://cdn.sqhk.co/tejilunuf/XjtvhjA/qt_hearon_circle.pdf
    • https://fanuterose.weebly.com/uploads/1/3/3/9/133999321/wubojifisu.pdf
    • https://cdn-cms.f-static.net/uploads/4501231/normal_6067d4b629cb3.pdf
    • https://cdn.sqhk.co/puxedimuwo/Iqgcqgg/zepeto_creator_payment.pdf
    • https://cdn-cms.f-static.net/uploads/4474722/normal_60315c738cb78.pdf
    • https://static.s123-cdn-static.com/uploads/4385038/normal_5ff9185319933.pdf
    • https://static.s123-cdn-static.com/uploads/4474992/normal_5ffc76aa364ba.pdf
    • https://static.s123-cdn-static.com/uploads/4503987/normal_5fed6446ad83b.pdf
    • https://cdn-cms.f-static.net/uploads/4476925/normal_60212a4588cc6.pdf
    • https://gugekomu.weebly.com/uploads/1/3/0/9/130969097/970831.pdf
    • https://cdn-cms.f-static.net/uploads/4461780/normal_604f2c3685999.pdf
    • https://static.s123-cdn-static.com/uploads/4404739/normal_5fe4f0db0ebc6.pdf
    • https://fotikelotoni.weebly.com/uploads/1/3/4/6/134684504/6fc5c47f6de.pdf
    • https://static.s123-cdn-static.com/uploads/4475734/normal_5fdea3fc93ed3.pdf
    • https://static.s123-cdn-static.com/uploads/4403937/normal_5ff40d14153b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lomogas/the_road_to_wigan_pier_audiobook_download.pdf
    • https://s3.amazonaws.com/xubifupi/what_is_the_book_a_bad_case_of_the_stripes_about.pdf
    • https://s3.amazonaws.com/borokegujuzero/58946863498.pdf
    • https://s3.amazonaws.com/pajeriramal/9031283306.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_off00011c5f.bin
dd509ccd83b76a9aa92f929ba899c2cda13f719917c432373290452429ef693b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5F 5592 bytes
font_01_sfnt_off00012f8e.bin
ff19c82d174c1f2aee58ff7b6a9daa0dfaa26f134b6c26053d5f3856942fb143		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8E 10320 bytes

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