Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8d064ba7dc66b1…

MALICIOUS

PDF

41.7 KB Created: 2011-01-14 00:21:13 +02:00 Authoring application: http://google.wiki.usfca.edu/ (via mPDF 5.0)
MD5: 2210b9b277a68353bfc350988159cca0 SHA-1: 48bc86edc0bbfced2a95bdbd8de01a4c4e939d92 SHA-256: 5e8d064ba7dc66b1f3fc9baa0125ffedda4fbc943d897312d83d916942fd83d1
108 Risk Score

Malware Insights

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

The PDF document contains obfuscated JavaScript that utilizes the getURL function to redirect the user to a suspicious external URL. This JavaScript is designed to download and execute a secondary payload, indicating a downloader or initial access vector. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a 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://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 0x9F6B 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_off00001767.bin
dcd1ba64d747e0bf0b9b8ecc270a7bea07ca4cd5917a768cd217f1d51287033b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1767 17772 bytes
font_01_sfnt_off00004582.bin
a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4582 17892 bytes
font_02_sfnt_off000073c2.bin
4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C2 18720 bytes

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