Conficker — PDF malware analysis

Static analysis result for SHA-256 5f6dcd8589f31aa6…

MALICIOUS

PDF

222.2 KB Created: 2010-05-07 18:48:03 +02:00
MD5: 506e32aa340b682bb8477fafdf69e81c SHA-1: 94704e0a987ae5bc27c2882b2976c920b13d607b SHA-256: 5f6dcd8589f31aa6c85138f9796bb7be1ccf21d9e633a90ce3a382e05881d583
260 Risk Score

Malware Insights

Conficker · confidence 95%

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

This PDF file contains embedded JavaScript and an embedded Windows executable payload, identified by ClamAV as Win.Worm.Conficker-10020152-0. The JavaScript likely facilitates the execution of the embedded PE payload, which is a common Conficker worm distribution method. The embedded URL, while benign, is part of the PDF's structure and may have been used in a phishing context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8359

Heuristics 10

  • Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD
    PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
  • ClamAV: Win.Worm.Conficker-10020152-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Worm.Conficker-10020152-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • SubmitForm action medium PDF_SUBMITFORM
    PDF has a /SubmitForm action — form data can be silently posted to an attacker-controlled URL (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.google.com/[5/7/2010
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/
    • http://www.google.com/search?q=Tchaikovsky&ct=tchaikovsky10-hp&oi=ddle
    • http://www.google.com/search)/FS/URL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
malware.bin
6ec4b8e7a1c5f3e289bf126822e5a158e168998d1b7be31e07c1278707f8cc6c		 pdf-embedded-file PDF EmbeddedFile object 107 at offset 0x10DEA 168371 bytes
Detection
ClamAV: Win.Worm.Conficker-10020152-0
Obfuscation or payload: likely
Carved artifact entropy is 7.91, consistent with packed or encrypted content.
stream_000_off00000060.js
59bd7d034efc9caeeff55702df9cb2e409eeb637c1926b388fcb99f3fde8855f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x60 7109 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).

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