Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc19a987bfaaa9f5…

MALICIOUS

PDF

131.4 KB Authoring application: Karbon
MD5: 09c9c1ea0884eec7415471749bf478bd SHA-1: 17e2d48261b0a7b3e03d36de06becc468200743e SHA-256: fc19a987bfaaa9f5b7f888287ace274b579892668009f897d2a1c4347d98e473
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating a large number of external links. The document body also contains multiple URLs, suggesting a phishing or redirection attempt. ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports a malicious phishing intent. The embedded URLs are likely used to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://badasscoinrings.com/uploads/1/3/0/3/130323522/kolibivu-gowuzunum-jebegenen.pdf
    • http://pute.asmiskfo.ru/uploads/2020/01/29/7955422.pdf
    • http://bananas.care/uploads/1/3/0/5/130588966/peturemeruxo-jokuwodazumakij-dubamig.pdf
    • http://zemamaro.lechenie-psoriaza.ru/uploads/2020/01/28/4936235.pdf
    • http://singaporenails.com/uploads/1/3/0/5/130550881/fb2b51.pdf
    • http://betteryoungminds.org/uploads/1/3/0/5/130542985/130542985.html#tupac+shakur+legacy+book

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000125d.bin
3b84bf26c46b381251b8a6b13e5a0ea0c336c12c4fe020e4d6eaa8e3f684ff8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125D 9760 bytes
font_01_sfnt_off0001260d.bin
d5df195aab1013dba8f75f0de14210b0a429b031e75e0e1cd9f446d2f732fa6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1260D 16576 bytes

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