Malicious PDF — malware analysis report

Static analysis result for SHA-256 121832fe82854110…

MALICIOUS

PDF

238.0 KB Created: 2015-08-25 07:52:38 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))
MD5: 39c4342d72b05db015d71a2aadd7797a SHA-1: 83fc42516d33c61e8363ed6c9d2be76103852f91 SHA-256: 121832fe828541106108022cbca5bf63a3826af6f595551c3fdcc10798f258c7
112 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, flagged by heuristics as a malicious payload. This script is likely responsible for contacting the URL http://serw.comcastraffic.pro/ to download and execute a secondary malicious file. The ClamAV detection name 'Pdf.Dropper.Agent-7230721-0' further supports its role as a dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9230

Heuristics 3

  • ClamAV: Pdf.Dropper.Agent-7230721-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7230721-0
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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://serw.comcastraffic.pro/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000c26c.bin
a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC26C 264072 bytes
embedded_pdf_script_0003b4f8.bin
949fbf08ddb2edbcad8746f2d01b83632849bd26cc15ed6de5b24758ba93a23b		 pdf-embedded-script PDF decompressed stream script payload at offset 0x3B4F8 243687 bytes

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