Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a41dd37f654b408…

MALICIOUS

PDF

56.8 KB Created: 2011-01-14 00:19:15 +02:00 Authoring application: http://google.wiki.usfca.edu/ (via mPDF 5.0)
MD5: aebb94b002ae5af6c50fcc102e69cb82 SHA-1: cf647162ab39381696d3205a1eaf1346e4a22232 SHA-256: 0a41dd37f654b4080a866b241130391e23901269fdf0e958c7b8fbe659c0d4a4
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 attempts to redirect the user to 'http://searchglobalsite.com/in.cgi?17'. This behavior, combined with ML classifier and heuristic detections for obfuscated JavaScript and URL redirectors, strongly suggests a malicious intent, likely to deliver a second-stage payload or conduct a phishing attack. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9145

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://searchglobalsite.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_obj0038_000.js
a2620a0be21a26956e8296a3c8163c8c260cb6a920586f15a19c6e170ac30940		 pdf-javascript-stream PDF /JS object 38 at offset 0xDB56 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_004_off000020a6.bin
538a71d0ecd8bc67f5241f6c57498c4ba5ad08ba4e345367ef0ce877589a14f4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x20A6 17892 bytes
font_01_sfnt_off00004f0a.bin
a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F0A 17892 bytes
font_02_sfnt_off00007d4a.bin
4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4A 18720 bytes
font_03_sfnt_off0000afd7.bin
e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD7 18756 bytes

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