Malicious PDF — malware analysis report

Static analysis result for SHA-256 427901f81e6a8b24…

MALICIOUS

PDF

13.9 KB
MD5: c7aad30647da18a545ea2825d4718506 SHA-1: c996bbb2d4083f4c523730aa4279b7fd92731035 SHA-256: 427901f81e6a8b244a14c68f7ce49e4c3c385694bd1efc9d4e59423df65ea802
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded files and scripts, indicated by multiple PDF_EMBEDDED heuristics and an ML classifier flagging it as malicious. The presence of an embedded script payload suggests an attempt to execute malicious code upon opening. The embedded URL is likely part of the lure or exploit chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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.xfa.org/schema/xfa-locale-set/2.1/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0041.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 41 at offset 0xB02 85 bytes
embedded_file_obj0042.bin
dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0xBB4 1029 bytes
embedded_file_obj0121.bin
38deb84933d3d6f05eac6dc5e3b88d80a1b8daef2207a2406c19c74567c2d5de		 pdf-embedded-file PDF EmbeddedFile object 121 at offset 0xDCE 64677 bytes
embedded_file_obj0044.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x3253 144 bytes
embedded_file_obj0045.bin
10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x3300 77 bytes

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