Malicious PDF — malware analysis report

Static analysis result for SHA-256 c611f20a5dcb2faa…

MALICIOUS

PDF

66.2 KB Created: 2020-12-22 02:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: acd93b6e712feaf9847c1295d765e20f SHA-1: 199d969ca78e04bc1944459ef8a42bb643720d8c SHA-256: c611f20a5dcb2faa7c7ceeeca95d6630e658a8f64d9db24cf79da3f92dc4b7be
214 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of numerous external PDF links suggests a link farm or redirection scheme designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffking.ru/strik?utm_term=clueless+outfits+online In PDF document text
    • https://bepupigo.weebly.com/uploads/1/3/4/3/134317889/7271870.pdfIn PDF document text
    • https://zulunapakaf.weebly.com/uploads/1/3/1/0/131070820/36a239d7768d480.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/4e357bb7-5977-49a3-8e26-b5fec91e036f/daronozuvijunafetaxoj.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/lodudebeboxow.pdfIn PDF document text
    • https://s3.amazonaws.com/remoxi/peoplesoft_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4cbeb3-1fea-4463-8039-1a2414332dfd/identifying_plagiarism_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/chemical_oxygen_demand_vs_biological_oxygen_demand.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/linkedin_logo_for_email_signature.pdfIn PDF document text
    • https://s3.amazonaws.com/suzeduselu/19048544230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d88c63-3153-43c5-b5bb-6ceee0745368/roxuteg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dbd11c4-2473-4fed-9f70-9a82da4f9b51/mindfulness_workbook_for_ocd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abeb22db-6ead-482c-b858-f1f4de9e2ff4/56939626963.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/rabuliwufadenarolijexiw.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_off0000c9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CA 4360 bytes
SHA-256: cbe21a93a2bd36ab5a912bd8320d27448af25ee9d0b1b7f547f025a0877bf609
font_01_sfnt_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 10412 bytes
SHA-256: 41adf579a479c1a0baf0677b5591de510e11025d00690e32b3fa0ac6a938749a

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