Malicious PDF — malware analysis report

Static analysis result for SHA-256 61833fbca0fcddb3…

MALICIOUS

PDF

53.7 KB Created: 2012-09-15 11:30:07 +04:00 Authoring application: Wordpress.com (via mPDF 5.0)
MD5: 908fd5b9e4536ff6e7f407fdbb35a68b SHA-1: 2eaa15d07641150311feda27e045b9f27b81fde3 SHA-256: 61833fbca0fcddb3181d6a784e9647a0c76cc95ba0d4bd66331496f3cae7c534
108 Risk Score

Malware Insights

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

The PDF contains obfuscated JavaScript that, when decoded, reveals a URL to 'globalsearchings.com'. This URL is likely used to serve a second-stage malicious payload. The ML classifier and heuristics strongly indicate malicious intent, and the use of JavaScript within a PDF points to a common delivery method for malware.

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?17
    • 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
cd6097ae9725eedeb8d68162b4d969180785ce4cb6006439670b9637b33de890		 pdf-javascript-stream PDF /JS object 36 at offset 0xCDB7 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_off00001359.bin
ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1359 17756 bytes
font_01_sfnt_off0000416b.bin
a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x416B 17892 bytes
font_02_sfnt_off00006fab.bin
4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAB 18720 bytes
font_03_sfnt_off0000a238.bin
e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA238 18756 bytes

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