Malicious PDF — malware analysis report

Static analysis result for SHA-256 882a0b8cdf1fcc76…

MALICIOUS

PDF

811.9 KB Created: 2010-09-17 21:29:20 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))
MD5: 5fc08fb045e30b4c38a1d9686a0d2013 SHA-1: a42e1062de14dc9a6f261c229eb9e6c44bb1b884 SHA-256: 882a0b8cdf1fcc766546854c286427bcfb8259a3ca60ba36e21b55f6e9ac9c9f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a hidden iframe pointing to an external URL, indicating an attempt to redirect the user to a malicious website. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of an embedded URL and the heuristic for a hidden iframe are strong indicators of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://www.gnu.org/copyleft/gpl.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ba7c.bin
a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBA7C 264072 bytes

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