Malicious PDF — malware analysis report

Static analysis result for SHA-256 643dd5d5a61f3bcc…

MALICIOUS

PDF

41.1 KB Created: 2012-09-15 11:29:35 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)
MD5: 221c5613c656fe50548fc57ce8988b24 SHA-1: 8ceb72fb472ca15b0839e860bbdc5b8ad12460ad SHA-256: 643dd5d5a61f3bcc37941c7a8f0336937cf0360a0a34265b8ee62c4221b81a27
108 Risk Score

Malware Insights

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

The PDF contains obfuscated JavaScript that utilizes the getURL function to redirect the user to 'http://globalsearchings.com/in.cgi?17'. This behavior, combined with ML classification and heuristic firings indicating obfuscated JavaScript and a URL redirector, strongly suggests the document is designed to download and execute a malicious payload. The obfuscated URL is reconstructed from the JavaScript stream.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • Obfuscated document JavaScript getURL redirector high PDF_JS_OBFUSCATED_GETURL_REDIRECTOR
    PDF document-level JavaScript automatically calls getURL() on an HTTP(S) destination hidden behind percent escapes. The decoded path is a redirector-style endpoint such as /in.cgi or /go.php. This is malicious routing behavior rather than a PDF parser CVE.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://globalsearchings.com/in.cgi?17
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0029_000.js
cd6097ae9725eedeb8d68162b4d969180785ce4cb6006439670b9637b33de890		 pdf-javascript-stream PDF /JS object 29 at offset 0x9C20 136 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
stream_003_off00001425.bin
ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1425 17756 bytes
font_01_sfnt_off00004237.bin
a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4237 17892 bytes
font_02_sfnt_off00007077.bin
4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7077 18720 bytes

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