Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5ca0c5b964b88f…

MALICIOUS

PDF

9.1 KB
MD5: a070bf18d27f2361031c862f02995b64 SHA-1: 6144835689fee91059f5a489e24f3adf4260e493 SHA-256: 4d5ca0c5b964b88f2560ce267dbb4e545581528cf7c1152b55fb30ffbb4274da
74 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1566.001 Phishing: Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains embedded script payloads and embedded files, indicating an attempt to deliver a secondary malicious component. The presence of an AcroForm button with an action trigger suggests an interactive lure to execute the embedded content. The embedded URL, while seemingly benign, is part of the document's structure and may be used in conjunction with the exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 0xCF3 85 bytes
embedded_file_obj0042.bin
dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0xDA5 1029 bytes
embedded_file_obj0111.bin
12d68d07890485d92fefbcea1111f2ba3fd7593004695d7217daf809c6075f10		 pdf-embedded-file PDF EmbeddedFile object 111 at offset 0xFBF 57692 bytes
embedded_file_obj0044.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x1F2D 144 bytes
embedded_file_obj0045.bin
10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x1FDA 77 bytes

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