Malicious PDF — malware analysis report

Static analysis result for SHA-256 7636cb703d94ceb4…

MALICIOUS

PDF

72.4 KB Created: 2020-12-31 14:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 550450ab6f940bb3ef82a99c93561fb8 SHA-1: 42b165361952e74de8288cf1b45cd929e1fa628d SHA-256: 7636cb703d94ceb4d0a4459b6e43857e4744a8cedadbd7dd08ef16c7b6a41666
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or spamming campaign. The embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm are indicative of techniques used to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=crossy+road+space+mascots
    • https://cdn.sqhk.co/netimawifes/Ffhchbn/cake_decorating_design_ideas.pdf
    • https://cdn.sqhk.co/luvuxokam/2hchdZD/meme_soundboard_unlimited_meme_sound_download.pdf
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/xibora.pdf
    • https://zuzameponotu.weebly.com/uploads/1/3/1/6/131606203/boxegizif.pdf
    • https://degujipimisa.weebly.com/uploads/1/3/1/4/131453395/fipidetedopapiradu.pdf
    • https://cdn.sqhk.co/ritafase/RjacijT/nilokujedosug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lusegokaves/467460229.pdf
    • https://uploads.strikinglycdn.com/files/616a505c-db00-449e-8b02-0171281ff3ec/litas.pdf
    • https://s3.amazonaws.com/nagev/lubak.pdf
    • https://uploads.strikinglycdn.com/files/68f1abad-3b6e-4ea5-ac5c-f883583db139/better_camera_mod_1._15._2.pdf
    • https://uploads.strikinglycdn.com/files/12e36c71-7afb-4c69-8d89-40155f24b8a5/72347273382.pdf
    • https://uploads.strikinglycdn.com/files/8cc0db80-8609-4cbb-b3b5-2cdc6293e8d6/96293604904.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_off0000db76.bin
1df8f9a66cb254bede2761d7b0bbfb0ddd321739b99b8b68082c7225f1c02bb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 5192 bytes
font_01_sfnt_off0000ed0e.bin
ad7c7df346082bbdef88265d55929471fb633741df7d067448a0afc9ff87cbce
pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 11960 bytes