Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ce4148b5b6714b…

MALICIOUS

PDF

13.3 KB
MD5: 42f658b2d822972ed1c80e5828223824 SHA-1: 79c4c989bd6a741df8e59a9d77d9d654a5071153 SHA-256: 88ce4148b5b6714b7efe5de523c0ac0e4f96c744984197c7c31f45aa88012c34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a malicious PDF exploiting a known vulnerability. High-confidence heuristics indicate the presence of shellcode designed to download a secondary payload from the URL http://at-news-today.info/explanation/mediums_operators-derive.php?fcha=1h:1k:1n:1h:1i&iqsiov=1o:1n:1m:1i:1l:2v:1h:1n:32:1i&fcyuo=1g&ibqnynnp=bfwgrx&hizpzbr=puimcle. This behaviour is consistent with a PDF-based exploit dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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).
  • 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://at-news-today.info/explanation/mediums_operators-derive.php?fcha=1h:1k:1n:1h:1i&iqsiov=1o:1n:1m:1i:1l:2v:1h:1n:32:1i&fcyuo=1g&ibqnynnp=bfwgrx&hizpzbr=puimcle
    • http://www.xfa.org/schema/xfa-locale-set/2.1/
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.2/
    • http://www.xfa.org/schema/xfa-data/1.0/

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 0x27BD 85 bytes
embedded_file_obj0042.bin
dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x286F 1029 bytes
embedded_file_obj0043.bin
ca2bacb751843d9af8db80af38fd7755052acc2dcc98e1f009f167d1d0743782		 pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x2A88 1867 bytes
embedded_file_obj0044.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x2EE2 144 bytes
embedded_file_obj0045.bin
10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x2F8E 77 bytes

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