Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23553e1b2c47c7e…

MALICIOUS

PDF

44.1 KB Authoring application: GIMP
MD5: 2c76d9a15b0624a5b9601b014c2854e8 SHA-1: 57dfec51fa1ac3c7d796afc85400fd423d89506d SHA-256: f23553e1b2c47c7e61a4e8c1edf714776b685788a6d8ad1a1caf9c19dd605831
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to external websites, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. The embedded content, though obfuscated, appears to be a lure related to 'Caterpillar generator sizing guide' to entice clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://sharoncraryhandwovenrugstapestry.com/uploads/1/3/0/5/130538939/povuzibida_siganev_nowovopemusu.pdf
    • http://dag2015.weebly.com/uploads/1/3/0/3/130323761/f80dd452be6bc.pdf
    • http://ambermayde.shop/uploads/1/3/0/2/130289177/volazurofajunip.pdf
    • http://northwestuu.com/uploads/1/3/0/2/130291485/130291485.html#caterpillar+generator+sizing+guide

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000103f.bin
016e2c3d18a2572388cdbd6afe1e8923c26a2fd5ffaa16fa4ce00fdea2790b82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103F 9164 bytes

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