Conficker PDF malware analysis — malicious · 2e08762ff0208476

MALICIOUS

PDF

222.2 KB Created: 2010-05-07 17:38:12 +02:00

MD5: 8decf2706831b4e6f57736ab8ccb67e6 SHA-1: 2c432cbc73f2f6c3047a2159595de5e485bf043c SHA-256: 2e08762ff02084767847f25a2db1e8eba24e02ab942000dbdeeff2cfa603f286

228 Risk Score

Malware Insights

Conficker · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

This PDF file is malicious, containing embedded JavaScript and a PE payload. The JavaScript, found within a decompressed stream, is responsible for initiating the attack. It is designed to download and execute a secondary payload, as indicated by the 'PDF_EMBEDDED_PE_PAYLOAD' heuristic and the ClamAV detection of 'Win.Worm.Conficker-10020152-0' on both the main file and the extracted artifact. The presence of a SubmitForm action suggests an attempt to exfiltrate data or redirect the user.

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.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`malware.bin` `6ec4b8e7a1c5f3e289bf126822e5a158e168998d1b7be31e07c1278707f8cc6c`	pdf-embedded-file	PDF EmbeddedFile object 85 at offset 0x10DED	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_off0000005f.js` `e846458a95b38893457db4b6a8693b5c542978f9b1c36bc601d11dc27c413e0f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5F	7101 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).

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