Malicious PDF — malware analysis report

Static analysis result for SHA-256 71308745b6cecbbb…

MALICIOUS

PDF

793.7 KB Created: 2010-09-15 21:47:01 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))
MD5: 044e63a87dbfb9dafa3e6c50d54e777e SHA-1: b19dc92b557a3c45b025c30001fe3259322a12e5 SHA-256: 71308745b6cecbbb259d8d083c3bb1aa76129fea7a3b6590be6db3b50a6e9b14
132 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection for Html.Spyware.IMG-7 and an ML classifier indicating maliciousness. It contains a hidden HTML iframe, suggesting an attempt to redirect the user or load external content. The presence of an unknown reputation URL, http://www.codeforum.cn/free/max1.htm, is suspicious and likely serves as a download source for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

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_004_off0000cec8.bin
a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCEC8 264072 bytes

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