Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb77b5790891f42…

MALICIOUS

PDF

443.4 KB
MD5: 19821d377d417af3598e8fb8f8f81c0f SHA-1: 1702c23f1da4ac4a6f6b94e4d6246776b5bf99de SHA-256: 5bb77b5790891f42208d9224a231059ed8e16b7174228caa9dc201329288a741
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains XFA form elements and an embedded URI pointing to a lure related to hacking Facebook accounts. It also exhibits characteristics associated with CVE-2023-26369, a known vulnerability in Adobe Reader. The document's content suggests it is designed to trick users into handling a password-protected archive, a common tactic to bypass security scanning.

Machine Learning

  • Nyx PDF Classifier clean score 0.0064

Heuristics 5

  • TrueType bitmap font + active content — CVE-2023-26369 related high CVE related PDF_CVE_2023_26369_RELATED
    PDF embeds a TrueType font with bitmap tables (EBDT/sbix/CBDT) alongside exploit delivery indicators — CVE-2023-26369 exploits the sfac_GetSbitBitmap function in Adobe's libCoolType for arbitrary code execution. This CVE was actively exploited in the wild, but this rule does not validate the malformed EBLC/EBDT primitive.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic (matched inside decoded stream)
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://www.reapinfo.org/hackfacebook
    • http://www.w3.org/1999/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://www.microsoft.com/typography/ctfontshttp://www.fonts.comMicrosoft
    • http://www.microsoft.com/typography/fonts/default.aspx

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_012_off00005337.bin
a61e30b8379091c218d31c70ad7f616ea3783290134f8ef7f0dbbb57b9e9d6b9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5337 8204 bytes
stream_020_off00006b12.bin
ba8dd574e2bbd57072c9b241d8d8b05d98bd8f98692165505376234c58cf0dc8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6B12 291684 bytes

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