Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e710f1bdbb6f0e9…

MALICIOUS

PDF

84.7 KB
MD5: 1a2014369896e88f585c69a07b810dba SHA-1: 420e2d28c2174c32bfbd428f142949b9a2221927 SHA-256: 5e710f1bdbb6f0e9607d478f11f9edb20aa2271d19cc4a09483d3ced167d4d31
158 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains JavaScript that automatically executes upon opening. This script displays a fake 'Adobe Acrobat Updater' alert to the user, then attempts to submit a form to 'http://spamchallenge.msftemail.com/XcmVrjaXBpZWx50X2lkPTpM5MTE0ZYMTA3fNSZjYW1whYWXlnbl9ydW5faWQ9MTU0BODg4MyZhY3Rpb249YXR0YWNobWVudA==#FDF'. This indicates a social engineering lure designed to exploit user trust and potentially download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7538

Heuristics 7

  • PDF auto-runs JavaScript form submission on open critical PDF_OPENACTION_JS_SUBMITFORM
    PDF uses /OpenAction to run JavaScript that calls submitForm() with an external HTTP(S) URL. Opening the document triggers the outbound submission path without requiring a normal link click.
  • PDF JavaScript shows fake Acrobat updater prompt high PDF_FAKE_ACROBAT_UPDATE_LURE
    PDF JavaScript displays Acrobat/update-themed language such as a document rendering engine update or remote connection to Adobe servers. When paired with JavaScript or external submission, this is a social-engineering lure rather than benign document text.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://spamchallenge.msftemail.com/XcmVrjaXBpZWx50X2lkPTpM5MTE0ZYMTA3fNSZjYW1whYWXlnbl9ydW5faWQ9MTU0BODg4MyZhY3Rpb249YXR0YWNobWVudA==#FDF
    • http://spamchallenge.msftemail.com/XcmVgjaXBpZWF50X2lkPTlM5MTE0vkMTA3NNSZjYW1wqYWhlnbl9ydW5faWQ9MTU0tODg4MyZhY3Rpb249Y2xpY2smdXJsPWh0dHBzOi8vdHJhaW5pbmcua25vd2JlNC5jb20vcGFnZXMvZWY5MDczMGFkZDA=
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0016_000.js
afc370ee13df3165dead677d157dc8eb5cfeccc150edd4e9116f3d1257dea54e		 pdf-javascript-stream PDF /JS object 16 at offset 0x345 392 bytes
font_00_cff_off00001350.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x1350 4575 bytes

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