Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc50b604de64586…

MALICIOUS

PDF

38.4 KB Authoring application: PDFBox
MD5: da71693a296b7bbf6fc1a06983c1143b SHA-1: 9e1fa27f8b40a009e122ab20bc1912116e9a7521 SHA-256: fdc50b604de6458655b58b497c14bb3455dec5e98fafbc97bba20794a2e32e75
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, and ClamAV detected it as phishing malware. The document body itself is largely obfuscated but contains the URLs, suggesting a redirection scheme to distribute 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://laylowtow.com/uploads/1/3/0/5/130538959/6934414.pdf
    • http://studentsmentalhealth.net/uploads/1/3/0/4/130475881/d0613d862251b85.pdf
    • http://humblemarketkitchin.com/uploads/1/3/0/2/130289711/0e0b3662b04.pdf
    • https://xibemeragebuti.weebly.com/uploads/1/3/0/4/130435629/2247378.pdf
    • http://maryleekemper.com/uploads/1/3/0/7/130740018/d64347fc.pdf
    • http://battagliaresearchgroup.org/uploads/1/3/0/6/130621392/3373397570fb2.pdf
    • http://mychinesewatch.com/uploads/1/3/0/5/130551214/130551214.html#relative+pronoun+worksheet+grade+6

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001109.bin
3f4c2e4fa4d97ac2b99ce6825ce6df5c5bfed8955143a0cdbdba5c29990a9b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1109 8092 bytes
font_01_sfnt_off000059ea.bin
734f66c00855ad757bb940939432f0625c955ebca24cea413703e2d7d546a083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59EA 2980 bytes

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