Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2e31722351b818…

MALICIOUS

PDF

90.9 KB Created: 2020-12-29 19:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7b8294a387d0ebddd6225b1b239dcf0 SHA-1: 1895857049c8408c1644af128ecf8067c8e9aaa9 SHA-256: fb2e31722351b818abbd62a8fe165d7896e2a2844810102ef876dca84c9e5c6b
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this PDF is part of a link farm designed to distribute malicious content, likely phishing or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=the+sacred+romance+free+pdf
    • https://cdn.sqhk.co/kizofapekeku/hbhg6jj/35981459683.pdf
    • https://cdn.sqhk.co/bopesajan/jhJidlm/duo_mobile_setup_on_iphone.pdf
    • https://nizomepovunamox.weebly.com/uploads/1/3/4/3/134305669/7897416.pdf
    • https://cdn.sqhk.co/sisadenev/oMXgjOJ/19262562266.pdf
    • https://xapilupu.weebly.com/uploads/1/3/4/7/134709440/dozegironavujip.pdf
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/vugurixanukix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f04ac002-858a-4b8b-a3b3-c206db43189f/vehicle_document_alert_notice_scam.pdf
    • https://uploads.strikinglycdn.com/files/f7f3b747-b405-431b-aa24-b8da67a15fdd/61458860003.pdf
    • https://uploads.strikinglycdn.com/files/03c46594-305e-498d-bad9-0d940dcbb261/buleba.pdf
    • https://uploads.strikinglycdn.com/files/e1274df5-4185-40b7-abe1-f4a2d92400e1/86177727255.pdf
    • https://uploads.strikinglycdn.com/files/4fe159c9-eb32-4e3c-8659-00ab68461d87/jurovejojawet.pdf
    • https://uploads.strikinglycdn.com/files/e98e5d53-5c1b-49cd-b855-4050e3503b58/74872369217.pdf
    • https://uploads.strikinglycdn.com/files/4bba2ab2-5000-4f47-aa0c-95c6127c4fa7/74147005712.pdf
    • https://uploads.strikinglycdn.com/files/5b68fc0b-350e-473e-b3be-1ef11b0c42eb/4504246784.pdf
    • https://uploads.strikinglycdn.com/files/e75c0481-ae65-4ccf-8b3d-bc13f549095b/palabras_primitivas_y_derivadas.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_off00012971.bin
7f835c2480eec8754495b83ccc66d593c6f8b879362cb4f5331ed848a320d81f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12971 5312 bytes
font_01_sfnt_off00013b52.bin
73147328058493349d74f81f44dc5e1e0e7d68427c189d0a6ea58c04d92ab5c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B52 10404 bytes

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