Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1ab1de75bf2bce…

MALICIOUS

PDF

313.1 KB Created: 2010-05-10 21:07:40 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))
MD5: d78485cbfa0dff086dbbddb336948897 SHA-1: c095f979962b8143d92bd60203ba0df8a6a57e15 SHA-256: 4c1ab1de75bf2bce4faab2f1287906f128a5770abafbe822d590d4f34e32e8e4
130 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Html.Spyware.IMG-7 and contained a hidden HTML iframe, indicating a malicious intent to redirect users. The ML classifier also strongly suggested maliciousness. The embedded URL http://www.codeforum.cn/free/max1.htm is currently of unknown reputation and is the primary indicator for potential redirection or further payload delivery.

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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