Malicious PDF — malware analysis report

Static analysis result for SHA-256 16192fbf92564560…

MALICIOUS

PDF

39.1 KB Authoring application: SWFTools
MD5: 647706c07928bb4e3e5c62e9f1067571 SHA-1: c6431b57c3b006294ba5dcb6a011190d51aee4be SHA-256: 16192fbf92564560548bf4a3bd5fe8152906addd3432c2b8d4536d637f695681
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique often used for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a mechanism for delivering further malicious content or redirecting users to malicious sites.

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://naaboard.com/uploads/1/3/0/3/130379331/3756189.pdf
    • http://actionanimals.tv/uploads/1/3/0/5/130539049/wilez.pdf
    • http://slaughtersclass.com/uploads/1/3/0/6/130621706/ee8223e5d1692c.pdf
    • http://daydreamtrip.com/uploads/2020/01/27/701514.pdf
    • http://reefnine.com/uploads/1/3/0/5/130551137/foziven.pdf
    • http://numberandcognition.com/uploads/1/3/0/6/130604188/vixoz.pdf
    • http://suchesfarmersmarket.com/uploads/1/3/0/6/130620471/4881632.pdf
    • http://woodlandstuition.com/uploads/1/3/0/6/130639269/130639269.html#innocence+ffxiv+extreme+guide

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001127.bin
84bd0b0af88e3eb3df8fd5a5e4bfc6a40a0179e0c3461122dfec6f687d843f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127 9092 bytes

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