Malicious PDF — malware analysis report

Static analysis result for SHA-256 8082f180d7d50f96…

MALICIOUS

PDF

1.66 MB Created: 1905-06-08 17:21:02 +09:00 Authoring application: QuarkXPress 3.3K: AdobePS 8.5.1 8.5.1 (via Acrobat Distiller 5.00 for Macintosh)
MD5: 6e19b509f71f910aa689780b9016bb0d SHA-1: 847ac68fdf0657faf8939bb5f7f1bb79609ab2f0 SHA-256: 8082f180d7d50f96c6102765ee86e3ede0d048b7fc0ab7148b27fa5e2ffd9014
80 Risk Score

Malware Insights

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

The PDF contains an embedded script payload and a hidden HTML iframe, indicating an attempt to exploit vulnerabilities or deliver malicious content. The presence of these elements, along with the high stream count and obfuscation heuristics, suggests a malicious intent. The embedded URLs 'http://www.ro521.com/test.htm' and 'http://j5b.kr/bin/h.js' are likely used to host or retrieve further malicious components.

Heuristics 4

  • 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 script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Unusually high stream count medium PDF_MANY_STREAMS
    PDF contains 501+ stream objects — may indicate heap spray or heavy obfuscation
  • 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.ro521.com/test.htm
    • http://j5b.kr/bin/h.js
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_001a7a5d.bin
2cc0ed1994d52573ae9ce80997243209dba08eb35da32aea2a05919320178633		 pdf-embedded-script PDF decompressed stream script payload at offset 0x1A7A5D 1735368 bytes
icc_00_off0000f6ee.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0xF6EE 3144 bytes
font_00_sfnt_off001992ce.bin
b39c3e08dfbac4c71d1e7be9b15f7d5e6f6f771f23c326b56c8392231fd1e667		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1992CE 9356 bytes

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