Malicious PDF — malware analysis report

Static analysis result for SHA-256 441942a195dc18ef…

MALICIOUS

PDF

1.05 MB Created: 2010-09-13 22:12:48 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))
MD5: e854566898508d8d82ce01f77deba3f8 SHA-1: f91aaeda7f4116b02aee3e0bace4d697ab798674 SHA-256: 441942a195dc18ef1a408179aca642e21c6ff45ffe3087fe1d63823daaa8c5bf
130 Risk Score

Malware Insights

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

The PDF contains a hidden iframe that points to an external URL, indicating an attempt to redirect the user to a malicious website. ClamAV detected this file as Html.Spyware.IMG-7, and a machine learning classifier also flagged it as malicious. The embedded URL http://www.codeforum.cn/free/max1.htm is the primary indicator of compromise.

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

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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