Malicious PDF — malware analysis report

Static analysis result for SHA-256 62764bc9597f4f18…

MALICIOUS

PDF

41.6 KB Created: 2012-10-19 02:58:21 +04:00 Authoring application: http://www.instructables.com (via mPDF 5.0)
MD5: 7593e8fd83ec06f9448403ab0e9a6796 SHA-1: 132d8c14490a64896f8d4d54d737843b2937f667 SHA-256: 62764bc9597f4f186ae720349e4b9a166f9c3edd23c40929f9e834cc7a29fdf5
108 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains obfuscated JavaScript that utilizes the getURL function to redirect the user to 'http://wwwsearchsites.com/in.cgi?3'. This behavior, combined with high-confidence ML and heuristic detections for obfuscated JavaScript redirectors, strongly suggests a malicious intent, likely to deliver a secondary payload or phish for credentials. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://wwwsearchsites.com/in.cgi?3
    • 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
86bd26d4bd59bd5bac918a1e6d170e9557ac2bab8e8f979ca129ff73eefa041a		 pdf-javascript-stream PDF /JS object 29 at offset 0x9FF6 127 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_off000017fb.bin
ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17FB 17756 bytes
font_01_sfnt_off0000460d.bin
a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x460D 17892 bytes
font_02_sfnt_off0000744d.bin
4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x744D 18720 bytes

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