Malicious PDF — malware analysis report

Static analysis result for SHA-256 311f38bc401fb45d…

MALICIOUS

PDF

35.3 KB Authoring application: Karbon
MD5: 2a58bc6f194fe71e16cb625b38e8eb8a SHA-1: 1beee4372e4a8e65ede16f9f336143f8a3c28cc1 SHA-256: 311f38bc401fb45da272a873ca5fe24ce7f460a590131954f50e734de83bdb17
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, a technique commonly used for SEO poisoning or to distribute malware. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious content or download further stages of an attack.

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://mchenryc.net/uploads/1/3/0/3/130313299/b0b71290870.pdf
    • http://tactical17.com/uploads/1/3/0/7/130739164/talokezugafat.pdf
    • http://michaelvincentmagic.com/uploads/1/3/0/4/130477839/mosabunud_pemew.pdf
    • http://vad.lavka-med.ru/uploads/2020/01/28/7bfb994a6c85.pdf
    • http://niacurriculum.com/uploads/1/3/0/6/130604836/vorixakafelafew.pdf
    • http://neuroimmunekids.org/uploads/1/3/0/6/130620926/7843491.pdf
    • http://mindfulness-et-sport.com/uploads/1/3/0/6/130639995/130639995.html#reading+comprehension+worksheets+2nd+grade+common+core

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001101.bin
a7007b5c5f37c45bfe62e72427c6c111e62ef60d9e187146f31a058c07dac479		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1101 8004 bytes

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