Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdf8224c83eda54…

MALICIOUS

PDF

40.0 KB Authoring application: PDFBox
MD5: a74c47f416d0b54612c62a1753f90b99 SHA-1: 42b85ea4985f2a448cfdf2cba84dc2b6f750dcdb SHA-256: 8fdf8224c83eda54640e871d99e144b316f5f0bba06bd8e572d7ba097c57b2bd
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, many of which point to other PDF files hosted on suspicious domains. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier strongly indicate malicious intent. The document body, while containing some seemingly legitimate text about salary guidelines, also embeds numerous URLs that are part of a link farm, suggesting a phishing or malware distribution scheme.

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://shantural.com/uploads/1/3/0/3/130379447/jopetuz.pdf
    • http://johntejada.net/uploads/1/3/0/2/130274301/pusimin.pdf
    • http://abetterwaytobreathe.com/uploads/1/3/0/4/130488696/molasoxito-reketixudexoro-fopikexabopa-butopubes.pdf
    • https://labetolimuliko.weebly.com/uploads/1/3/0/3/130324326/8957403.pdf
    • http://dnmlr.com/uploads/1/3/0/5/130551692/sukajojuraluko.pdf
    • http://charlottepropertync.com/uploads/1/3/0/4/130436140/sozakebavulibowep.pdf
    • http://riversidecountyhistory.org/uploads/1/3/0/4/130483537/130483537.html#american+organist+guild+salary+guidelines

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001132.bin
21b18ef2a807c578f6b4ca5ac19cdb6ce65ecb7c52cb8b4a92650109e044f21a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1132 8860 bytes

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