Malicious PDF — malware analysis report

Static analysis result for SHA-256 5852c085c9203b5c…

MALICIOUS

PDF

66.6 KB Created: 2020-11-25 19:28:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3394dd21127f610bc22266ae19520503 SHA-1: 1caea4e2591119a0a5ce9d63b75bcae6c51c7cac SHA-256: 5852c085c9203b5cd5037163293cc74ef5bcbb59e692dbf3f0c1f3fd80b80bfe
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'traffset.ru', which is likely part of a phishing campaign. The PDF also contains a large number of external links, suggesting it might be part of a link farm or SEO spam operation designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://traffset.ru/strik?utm_term=mayan+family+life
    • https://cdn-cms.f-static.net/uploads/4418001/normal_5fa53fa1a2590.pdf
    • https://cdn-cms.f-static.net/uploads/4382192/normal_5f9be68b3a737.pdf
    • https://cdn-cms.f-static.net/uploads/4485309/normal_5fbc75d333447.pdf
    • https://zujolifuwumew.weebly.com/uploads/1/3/4/7/134773321/5246051.pdf
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f9c6c8e30f55.pdf
    • https://cdn-cms.f-static.net/uploads/4467571/normal_5fbc6bd556b63.pdf
    • https://cdn-cms.f-static.net/uploads/4491148/normal_5fbc759d06b1c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/temujonuwu/72059463625.pdf
    • https://uploads.strikinglycdn.com/files/272fd530-fa06-4acd-853f-4bfb8c4e1936/white_spruce_tree.pdf
    • https://uploads.strikinglycdn.com/files/60efdd19-df24-486e-b917-03b57b4798de/poemas_de_leonardo_da_vinci.pdf
    • https://uploads.strikinglycdn.com/files/7e24ff4c-8939-4ca8-b400-a9153b7cb768/39203346770.pdf
    • https://uploads.strikinglycdn.com/files/c1239105-9abf-4a72-91f3-521d39336ce5/diguzosumijezi.pdf
    • https://uploads.strikinglycdn.com/files/1720ade9-3d8b-4db2-b318-0195f701e6c3/security_guard_test_preparation_guide.pdf
    • https://uploads.strikinglycdn.com/files/b38e563a-ef19-4071-ac90-6fb6d12b3801/destiny_2_calling_them_home.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93f.bin
e6483ff9002b55095b5a56accf66ad962e3926d351eda368ad0969d906e34be0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 4744 bytes
font_01_sfnt_off0000e96d.bin
3d8d27b01dee67c3f46f2ffe0e1376d2e8ecc6f74f82a20db54fbd49644d9f3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 9540 bytes