Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f55e4aa5a58cdb0…

MALICIOUS

PDF

54.3 KB Created: 2012-09-11 16:55:29 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)
MD5: e5c3579881db90444305c82fed48ab7f SHA-1: 018edb3d2323c8306abb00bfaaf9e7c5387c463e SHA-256: 5f55e4aa5a58cdb06febf41915aaec957d88a1a0a51280dedb98d73521b196d3
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 to a suspicious URL. This JavaScript is designed to download and execute a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9482

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?16
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0036_000.js
b549138dc1b00ea70ede2671460e6cd42d9e1c3bb812bf9653550df0951c4991		 pdf-javascript-stream PDF /JS object 36 at offset 0xD00F 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_off000015b1.bin
ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15B1 17756 bytes
font_01_sfnt_off000043c3.bin
a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43C3 17892 bytes
font_02_sfnt_off00007203.bin
4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7203 18720 bytes
font_03_sfnt_off0000a490.bin
e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA490 18756 bytes

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