Malicious PDF — malware analysis report

Static analysis result for SHA-256 22bce4d682d681e7…

MALICIOUS

PDF

313.1 KB Created: 2010-05-12 21:19:37 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))
MD5: ec4f78cf7f918c6948db0aaeca672197 SHA-1: c9e3b88fed664f7720613ac5b201c56907468c41 SHA-256: 22bce4d682d681e70fb7f508b4f639e3f0ad3560a02ac282b5b9519169a172e5
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 site. 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 0.9751

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_002_off0000b76c.bin
a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB76C 264072 bytes

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