Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae1340042abb685…

MALICIOUS

PDF

63.5 KB Created: 2021-01-03 23:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6fc96b798a87759fb9886b81f9044eb0 SHA-1: 6546fa6ffeea55c1945990d304a1f6b8eecbb0dd SHA-256: cae1340042abb685c59ef2eaaf20e5330052dda0970c57e944488065d229fb56
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 'traffmen.ru'. This URL is embedded within the document, suggesting an attempt to redirect the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of a malicious URL is a strong indicator of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/aws?utm_term=educational+administration+and+management+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_5fa933ba40684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5f96a6b0d3419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_5fd2ce1e9f4ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403118/normal_5fb7a833947c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_5fe69a45c1289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_5fdc8d94be621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_5f9b7a5921b83.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/7b025d13-1853-4752-b526-7d9ee4f3c2db/faxez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdadf6e1-c692-4739-80d1-0f291dcdd61b/best_url_shortener_to_make_money_in_india_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8806ec8-a238-49d0-a3a4-aeea6aeb428d/take_me_there_rascal_flatts_guitar_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab64cc6-339b-45f5-a8c5-49364b6d74f3/7294726220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc63bd7b-b70f-4c4b-b48e-f22f1fe8120c/samsung_ml-2525w_red_light_flashing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db6b1bf8-9ae6-4843-a1b1-b9a277d3c447/86901698425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4138b276-0942-485d-b07a-7c08c1699873/nepekakalelo.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_off0000bb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB23 5636 bytes
SHA-256: d7db73bbcbce64636159a954627c1a3fe572fd4fcf9728d5904d9774b8e17a8e
font_01_sfnt_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 10176 bytes
SHA-256: ccc3758ec8934e1bc6ef3cf92e59ea98ccc67ac9051e507d2385a26571ac121e

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