Malicious PDF — malware analysis report

Static analysis result for SHA-256 374f42d2dfc22873…

MALICIOUS

PDF

14.1 KB First seen: 2015-10-13
MD5: f023a04791fd6b59b531e54a48bf4696 SHA-1: ca578099e9558b5fa0026fbc8912bd9cba5b0490 SHA-256: 374f42d2dfc228730a5d083826877a2c26e1e3fed9c897e448cdf9773c7c3dda
176 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The ML classifier and ClamAV detection strongly indicate this PDF is malicious, specifically flagging it as an exploit. The presence of an embedded URL, despite its benign reputation, suggests a potential delivery vector for further malicious content. The PDF structure also contains elements commonly associated with exploit attempts, such as XFA forms and action triggers on buttons.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-36962 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36962
  • PDF exploit shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF exploit shellcode contains a hardcoded http(s) URL — stored as little-endian %uXXXX Unicode escapes, or hex-encoded in a document metadata field (/CreationDate, /Title) and referenced from the decoded script. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://199.241.190.67/values/chose-establishment.php?vvxawbw=30:1l:1h:33:1f&uxvdg=1i:1j:31:2v:31:1f:33:2w:1m:33&ctqu=1i&nshvnxb=bbebw&rsg=kgzz Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-locale-set/2.1/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.2/Referenced by PDF JavaScript
    • http://ns.adobe.com/xdp/In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0041.bin pdf-embedded-file PDF EmbeddedFile object 41 at offset 0x2ABC 85 bytes
SHA-256: c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb
embedded_file_obj0042.bin pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x2B6E 1029 bytes
SHA-256: dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91
embedded_file_obj0043.bin pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x2D87 1931 bytes
SHA-256: f44bf07a5e766e1ab751c881e0c803396c26566487c8d16ae18e3f70aa11a14f
embedded_file_obj0044.bin pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x3201 144 bytes
SHA-256: 3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169
embedded_file_obj0045.bin pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x32AD 77 bytes
SHA-256: 10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275

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