Malicious PDF — malware analysis report

Static analysis result for SHA-256 81131b03bb5063f4…

MALICIOUS

PDF

76.5 KB Authoring application: Karbon
MD5: 9d9234a5917f27aef4fbca2c08f79db5 SHA-1: f4ae3afaab9333e32b3a12008d811bc5b7d1bcf7 SHA-256: 81131b03bb5063f44524a67c3d2ff0cd82db8b0af5c3b31f1a5d4937cd79ae50
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, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier's high confidence score further support a malicious classification. The document body, though partially corrupted, contains references to medical guidelines and includes URLs that are part of this link farm, suggesting a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mydeckstairity.com/uploads/1/3/0/6/130604826/bugefiri-panukelofaw-xirelenilubug.pdf
    • http://blinddoghaven.net/uploads/1/3/0/6/130639781/36acc19b.pdf
    • http://m.wchqfm.com/uploads/1/3/0/4/130488616/9119874.pdf
    • http://somersetfoodtrail.org/uploads/1/3/0/7/130775786/130775786.html#guidelines+for+treatment+of+febrile+neutropenia

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010cb.bin
29e97a0cee3b6a250de528ab9367690db91bd2fe582c43ab977286d79f742e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB 9000 bytes
font_01_sfnt_off0000f336.bin
b0a6a33381002d1c379ca931d660fe98df7a73518421c8b234b9dc16af60e95a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 2696 bytes

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