Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1862a313f6ad16…

MALICIOUS

PDF

63.7 KB Created: 2020-11-11 15:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 53fe0826567c6ec690c8cab908cfd742 SHA-1: eade2c41f005f064af12f85a7d79b4c812b84f31 SHA-256: 6c1862a313f6ad1608c33afdef383f5eae982d41601b53a85fb8dff0bf6957c3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffking.ru'. ML classification and ClamAV also flagged this file as malicious. The embedded URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffking.ru/aws?utm_term=generating+equivalent+expressions+quiz In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_5fa3c927641fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422136/normal_5fab1eef61c88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f8750932ceb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f8d5d33c8132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5f9662c743331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_5f9cf04b702a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_5fa600c061e23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f87b01dcdb3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411918/normal_5fa46fafc65bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_5f8e1f3678abc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f33ad4-8754-4b18-be9c-b978e47ad0cd/nokasumujafeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3fa8f9b-40ad-4d15-ab2a-9cac9e41e54a/wildlife_learning_center.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/281dcf43-890d-4b64-94ba-f72e1e736c9f/the_mysterious_adventures_of_sherlock_holmes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c0f020-f9db-4278-b552-62184a884827/44757560954.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85A 5324 bytes
SHA-256: 39af4bf0afbcfdac33881127bb198c6428eae9ef56ab7dfdbaf3057d00f35aaa
font_01_sfnt_off0000ca94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA94 12168 bytes
SHA-256: 7715ec62aea5acec2febfa2687dfa12275bb24e71dbe5fc3baf51fbdfa4b88af

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