Malicious PDF — malware analysis report

Static analysis result for SHA-256 143c4bcbc65c4f5a…

MALICIOUS

PDF

6.8 KB Created: 2009-01-35 62:12:26 Authoring application: Adobe
MD5: 3a3cf450f15a79191af71df62e6cb170 SHA-1: 83ed3eb770233dbe7f12cfce5cf0d2e6f202d342 SHA-256: 143c4bcbc65c4f5a2a1cb32df8792b1444deceb661e10cccb2161af9e12e7155
270 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. The embedded JavaScript, particularly in legacy_pdfkit_stage_000.js, attempts to download a second-stage payload from the URLs http://kardan.uz.ua/101/sv777/load.php?spl=pdf_pack and http://kardan.uz.ua/101/sv777/load.php?spl=pdf_new. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 8

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • 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.
  • Suspicious extracted artifact info 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://kardan.uz.ua/101/sv777/load.php?spl=pdf_pack
    • http://kardan.uz.ua/101/sv777/load.php?spl=pdf_new

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0032_000.js
3ff527f73207bf72f011099ef795c52e2f0e09c08b114365915a67442f9f0a22		 pdf-javascript-stream PDF /JS object 32 at offset 0x39A 229 bytes
javascript_obj0034_001.js
7048dfd121c24cb4df76ab58637e9b84c6dcd39b12eaf2652d1e3503999eeb6b		 pdf-javascript-stream PDF /JS object 34 at offset 0x48D 336 bytes
javascript_obj0036_002.js
88fcfff01122ae7c8e838d7fb77af21e8b10939c1020ab2b4a4d213a4ace0f8f		 pdf-javascript-stream PDF /JS object 36 at offset 0x7C 206 bytes
legacy_pdfkit_stage_000.js
39dff5f0bd470fc6d533b74814e8964ef1586e2284a9735e5d1afebed9cb6424		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x5D6 1841 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
legacy_pdfkit_stage_001.js
4e598c9044f853b58aa44faa2ed1b7e3fec9bedae15bbdef64ac5466d17cdda6		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xBF9 2986 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
legacy_pdfkit_stage_002.js
48a783c1377b1cce8856db4ddc1d86a357485e42c425fd07704c8f5adb29f996		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x1325 1658 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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