Malicious PDF — malware analysis report

Static analysis result for SHA-256 9392f62e8ce7053f…

MALICIOUS

PDF

61.7 KB Created: 2020-12-06 19:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0de4a15dce8374597d2a9d59878d54a2 SHA-1: 7b3bb86faa0a0f12568ca1935ac219241232f3d9 SHA-256: 9392f62e8ce7053fb8314639d1f74cd7dd1bdb160b68c3280a3bba76ea6fccc9
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a significant number of embedded links, identified as a link farm, with one critical link pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=burrito+bison+revenge+2+hacked+unblocked
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/6813cba1eae81.pdf
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5f8950052d59e.pdf
    • https://cdn-cms.f-static.net/uploads/4425009/normal_5fa3897b9399c.pdf
    • https://wepebagelokej.weebly.com/uploads/1/3/4/5/134583559/fabim.pdf
    • https://cdn-cms.f-static.net/uploads/4413242/normal_5fafd78a5611e.pdf
    • https://lisamotakix.weebly.com/uploads/1/3/4/3/134308999/5899004.pdf
    • https://cdn-cms.f-static.net/uploads/4410432/normal_5f9476103d3bf.pdf
    • https://static.s123-cdn-static.com/uploads/4372384/normal_5fc87f043db95.pdf
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5f9ca78ea384e.pdf
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fc8738b1aa87.pdf
    • https://cdn-cms.f-static.net/uploads/4379982/normal_5f8b9e3c2d95e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7d01191f-623f-46da-b116-85212cc81032/dakine_split_roller_85l_gear_bag.pdf
    • https://static1.squarespace.com/static/5fc0e46f24b06a7eb3ff1788/t/5fc0f97fe18c5c478e1ebd27/1606482306916/caterpillar_3406_manual.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf6c173299f0c54395dcb/1606219459603/taxpayer_relief_act_of_1997_crossword.pdf
    • https://uploads.strikinglycdn.com/files/28978017-71ca-4700-8c8b-d5a10632783b/3605208771.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_off0000b407.bin
81c559ecea63d4e575a8fd88a281b6b3798c3a2e0f29616a92d2ea1bcab394ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB407 5648 bytes
font_01_sfnt_off0000c73c.bin
4e20f785b26119511ea73c2716002527797973ad2aff762d12d333afc7b642dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC73C 10072 bytes

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