Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bb9aef4fdd9abb…

MALICIOUS

PDF

41.2 KB Authoring application: pstoedit
MD5: 01ea196f1b4d3e33c52f9bae281a5596 SHA-1: c87c1e69a8eb0d96e63c5f135e8be3efd2d904e4 SHA-256: 43bb9aef4fdd9abb6cb7f8620e25a5f27a4a3e4ad189faf349c64a081ec13c15
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to other PDF files, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing. The document body, while partially corrupted, contains text related to job interviews and includes the same URLs found in the heuristics, reinforcing the phishing lure.

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://tamingbigfootseattle.org/uploads/1/3/0/4/130476943/e5e7f702608.pdf
    • http://tonibrannan.com/uploads/1/3/0/6/130620776/pipujawavogipizoda.pdf
    • http://striving4excellence.net/uploads/1/3/0/5/130589444/380c7cd9c30bbe.pdf
    • http://jdlockhartphotography.com/uploads/1/3/0/3/130313836/zaxoxokopaguv.pdf
    • http://montclairradiology.net/uploads/1/3/0/6/130639661/9d1d171055.pdf
    • http://avalonlinenrental.com/uploads/1/3/0/5/130550818/vawovipok.pdf
    • http://nupelicanparty.org/uploads/1/3/0/6/130605108/130605108.html#answers+for+why+you+left+a+job

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001129.bin
ae97fb668e5081d94cab9beea163727708b2f75f937a3a84205df030d9f2d120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1129 8272 bytes
font_01_sfnt_off0000594d.bin
c7143368894299a997ed09f05024df052d964886bc902d598de4a6791c50751f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x594D 10292 bytes

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