Malicious PDF — malware analysis report

Static analysis result for SHA-256 871bb57321cba6bb…

MALICIOUS

PDF

66.3 KB Created: 2020-12-19 16:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 41cf5461d242f58d8def98b79c47245f SHA-1: ceca194c68b6902f2a0678df3e88013d96e085a1 SHA-256: 871bb57321cba6bb4d19650434dbff30a093c422d3944bbcc9b2f8caf396c627
214 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to an 'Ekonomiks teaching guide'. The presence of multiple external PDF links, some benign and some unknown, indicates a link farm designed to distribute malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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.
  • 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.
  • 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=ekonomiks+teaching+guide In PDF document text
    • https://pepigapipewoma.weebly.com/uploads/1/3/4/0/134000130/8361397.pdfIn PDF document text
    • https://bolewotimeri.weebly.com/uploads/1/3/4/6/134689798/tuwuri-nujolu.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/ecbcb86b-e15a-46c1-b2a4-aab647d10bb7/32341634961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39fd573e-089a-4050-b22a-6547297fca41/12082018635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4ccaaa-f228-4503-8b48-19b4e3b4aa3c/80m_antenna_limited_space.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe06ec9b1ed03538a18bd3/1606289136425/kitchen_nightmares_sebastians_dailymotion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb4d186-92c6-4a38-8935-54fc6efb2cbd/11791767457.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/59802148450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb64c34-4c34-442c-8132-950490e4ca60/47605793564.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_off0000c667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC667 5248 bytes
SHA-256: 3edc2c9fab9cafb680c6da6dbbc02f3c80be08bd317ceb4f4b4b1683cd2f657f
font_01_sfnt_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 10844 bytes
SHA-256: 3d107744827da393ca73a6a0fe0def03a31a577eb395e5a5557abb3053118e22

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