Malicious PDF — malware analysis report

Static analysis result for SHA-256 442a648f7a7d2c4d…

MALICIOUS

PDF

64.0 KB Created: 2021-09-18 14:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a931675d3dc6bcd2b74495f6b9dbea75 SHA-1: 51d05d31752accadc8c12612115274753fd87fc2 SHA-256: 442a648f7a7d2c4d89d23173057ad42f6a0fa40e1c80f36cc85e31f1ffbae040
124 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains hosting PDF files, suggesting a link farm or distribution mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM firing further supports this, indicating the PDF is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8191

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://tttinox.com/upload/userfiles/files/pilinerodewoxizawusunawu.pdf In PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/lagamuturo.pdfIn PDF document text
    • https://seikai.jp/free_images/files/56438137126.pdfIn PDF document text
    • https://securitydm.com/slicice/file/xodedixogisixezavizo.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/43329332068.pdfIn PDF document text
    • http://baoveantam.info/upload/files/sodej.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/90574495163.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/27667786603.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/05/file/20210905_025806_152.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/kudiziwegi.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/teletilonim.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/43458920773.pdfIn PDF document text
    • http://letdentalab.com/img/files/65751782177.pdfIn PDF document text
    • https://linardi.ru/files/file/42823277273.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd7f886330---75946145332.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/losulufanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=merchant+of+venice+book+icse+pdf+free+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/servIn PDF document text

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