Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4f5c8018f9b55e…

MALICIOUS

PDF

56.1 KB Created: 2020-11-23 16:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a252941d766939389e3258dd6be019d SHA-1: 11b887bf615cad869c97617e946f098513b09ff7 SHA-256: fd4f5c8018f9b55edeaf4f47a11b5e809198a397ea0adc596345f076c9bb7363
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a deliberate attempt to direct users to harmful sites. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/123?utm_term=tci+test+answers
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/6204388.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tazibabebamep/puvofurinuxurofinakam.pdf
    • https://uploads.strikinglycdn.com/files/f86c681c-77d2-45f5-9a2f-1d91a5d5fa4f/gexuwaviwanafu.pdf
    • https://uploads.strikinglycdn.com/files/8e58351f-05b8-4885-ad14-4e797a1546cc/nimor.pdf
    • https://s3.amazonaws.com/mexavofezoxi/3.5e_races_of_stone.pdf
    • https://s3.amazonaws.com/widuxade/86000486078.pdf
    • https://uploads.strikinglycdn.com/files/d7196674-236f-4988-8770-a57deedc80eb/mugofapuleros.pdf
    • https://s3.amazonaws.com/wexoteluwag/razukonomejagodakigu.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_off0000a3a7.bin
bb59c95cfa6a95bb9af77d82b3a13945ce74722bfbd83e12f6363273b641fbe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3A7 4800 bytes
font_01_sfnt_off0000b41a.bin
7c8c6d854bd57bbdf7e7111ff46f2f3d419c2bed7586d279828de4d51721d840		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB41A 9472 bytes

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