Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d7ba32ad41923d…

MALICIOUS

PDF

1.05 MB Created: 2010-05-17 21:23:52 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))
MD5: 03a48ee697cd01fd87a2439eac2f8549 SHA-1: 0fdde0d2bc69751af6081634e51b14413a4fcf1a SHA-256: 11d7ba32ad41923d65f69b527a690276cb3ea46b29338ef700dd13e05ff81f17
132 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a hidden HTML iframe and a high ML classifier score, indicating malicious intent. ClamAV also detected it as Html.Spyware.IMG-7. The presence of a hidden iframe suggests an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting. The embedded URL http://www.codeforum.cn/free/max1.htm is currently unknown and warrants investigation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9791

Heuristics 3

  • ClamAV: Html.Spyware.IMG-7 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Html.Spyware.IMG-7
  • PDF contains hidden external HTML iframe high PDF_HIDDEN_HTML_IFRAME
    PDF bytes contain a hidden zero-size HTML iframe pointing to an external HTTP(S) URL. This is a strong malicious dropper/redirect indicator and is not expected in ordinary PDF content.
  • 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://www.codeforum.cn/free/max1.htm
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://www.iec.ch
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000b97b.bin
a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB97B 264072 bytes

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