Malicious PDF — malware analysis report

Static analysis result for SHA-256 b091881ba151470f…

MALICIOUS

PDF

793.7 KB Created: 2010-05-09 21:02:30 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))
MD5: 7d490166ac370a3415c47f2167799e86 SHA-1: 53d25918917cb94a75413d15ae80143689d9fc80 SHA-256: b091881ba151470f9a9b522ba7d36ef4fde711f8d1c991bd47c8348dfdb723a8
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a hidden HTML iframe, which is a common technique for redirecting users to malicious content. ClamAV detected this file as Html.Spyware.IMG-7, indicating malicious intent. The embedded URL 'http://www.codeforum.cn/free/max1.htm' is flagged as unknown and is the most suspicious IOC. The PDF structure and the presence of a hidden iframe strongly suggest an attempt to deliver a secondary payload or lure the user to a malicious site.

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

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