Malicious PDF — malware analysis report

Static analysis result for SHA-256 875e0fd5599d9d9c…

MALICIOUS

PDF

34.8 KB Authoring application: PDFBox
MD5: 1d7fc61045622939da3ac7fdd649a45d SHA-1: df65a422c4ed80a365db1874270642d517a6dce7 SHA-256: 875e0fd5599d9d9c062840f7a1610eedb05c19f4bdeb9176f1793da018e68a07
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links to external PDF documents hosted on various domains. The heuristic PDF_SEO_LINK_FARM indicates a link farm, suggesting a malicious intent to redirect users. ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 further supports a phishing or malicious redirection scenario. No scripts were extracted, but the structure points towards a delivery mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://nuzzdos.com/uploads/1/3/0/7/130776640/gataxasakurumerejo.pdf
    • http://drmsanchez.com/uploads/1/3/0/3/130313404/mozenejedewikumobivo.pdf
    • http://ciumontreal.com/uploads/1/3/0/5/130543682/kabulokuteginogaxezu.pdf
    • http://merbeinhistoricalsociety.com.au/uploads/1/3/0/6/130620854/kipamigulubiguk.pdf
    • http://caredynamicsfl.com/uploads/1/3/0/6/130604336/rogojagemij.pdf
    • http://djspizza1.com/uploads/1/3/0/5/130539584/130539584.html#present+simple+continuous+and+perfect+exercise+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000109f.bin
344b13a3656d9ba96d023bf22cc81ef1112b485d78ef3cfa552e922915f7e2e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F 7724 bytes

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