Malicious PDF — malware analysis report

Static analysis result for SHA-256 1761abdb08edfa7a…

MALICIOUS

PDF

42.6 KB Created: 2011-01-14 00:19:43 +02:00 Authoring application: http://google.wiki.usfca.edu/ (via mPDF 5.0)
MD5: 4615d1edef0312c8d18112396697b6ab SHA-1: 2d959075b6dbeb6b5e4cdc6bdaefcfd06478e7cc SHA-256: 1761abdb08edfa7a9de2e3f971267fa51ab3b3d4e370db4dca4679294f1ab997
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 to 'http://searchglobalsite.com/in.cgi?17'. This behavior is indicative of a downloader or initial access mechanism, likely intended to fetch and execute a further stage of malware. The ML classifier and specific heuristics strongly suggest malicious intent.

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://www.flacso.edu.mx/micrositios/colaboratorio/HTMLS/que_es_un_colaboratorio.html
    • http://searchglobalsite.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
a2620a0be21a26956e8296a3c8163c8c260cb6a920586f15a19c6e170ac30940		 pdf-javascript-stream PDF /JS object 29 at offset 0xA377 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_off00001ae4.bin
677771362eada1d7cadc1b2461d158aa3c59bdb5c68a2a011fc1b9b10fb414ff		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1AE4 17976 bytes
font_01_sfnt_off0000498e.bin
a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x498E 17892 bytes
font_02_sfnt_off000077ce.bin
4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CE 18720 bytes

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