Malicious PDF — malware analysis report

Static analysis result for SHA-256 588acd688e241119…

MALICIOUS

PDF

12.4 KB Created: 2019-04-30 10:32:43 +01:00 Authoring application: mPDF 5.7 First seen: 2021-10-23
MD5: 79748f3430548ac7c7dd534a68ffb966 SHA-1: c7f74e50435675db950e6bff4de4aeb006f996d8 SHA-256: 588acd688e241119faa97ae00b2988fb571fb93e93a26ae2cced4248bfec3669
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files, identified by the 'PDF_SEO_LINK_FARM' heuristic. While the document body is heavily obfuscated, the presence of numerous links suggests a malicious intent to redirect users to potentially harmful content. The ML classifier also flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8780

Heuristics 3

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://muicuiu.dumb1.com/8a07a01a04a08a03/La-hermandad-The-Brethren-by-John-Grisham.pdf In PDF document text
    • http://muicuiu.dumb1.com/4a05a00a02a07a00/Enter-the-Brethren-Brethren-of-the-Coast-1-by-Barbara-Devlin.pdfIn PDF document text
    • http://muicuiu.dumb1.com/4a09a00a04a01a03/The-Pelican-Brief-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/2a09a06a04a07a08/The-Firm-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/4a09a09a01a02a03/The-Partner-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/4a06a01a06a09a09/The-Chamber-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/5a02a08a03a06/The-Confession-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/4a00a04a07a00a05/The-Firm-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/2a07a04a09a05a07/The-Innocent-Man-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/4a00a03a03a06a06/The-Client-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/1a06a01a09a03a09/Calico-Joe-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/4a05a01a07a06a05/The-Litigators-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/3a03a05a09a01/The-Testament-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/2a04a01a08/The-Tumor-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/8a09a08a04/The-Reckoning-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/1a00a05a06a01a01a06/The-Pelican-Brief-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/4a00a07a08a07/The-Summons-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/2a03a00a08a06a09/The-Firm-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/7a07a06a04a09a05/The-Pelican-Brief-by-John-Grisham.pdfIn PDF document text
    • http://muicuiu.dumb1.com/3a04a07a02a08a03/Sycamore-Row-by-John-Grisham.pdfIn PDF document text

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