Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3ab9e59297c002…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: 43ffd60e64af14a7bc5915eb9f043d44 SHA-1: d1887cf549305f9ecc907beaa785fbb70738829e SHA-256: 6e3ab9e59297c00232c572201cddf51fbcc0947384baa4d90b969e99d7bae908
160 Risk Score

Malware Insights

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

The PDF contains JavaScript that triggers a fake Adobe Acrobat Updater prompt, attempting to socially engineer the user into clicking 'OK'. Upon user interaction, the script submits form data to a malicious URL, likely to download a second-stage payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9477

Heuristics 8

  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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 https://employeeportal.net-login.com/XTmpKbmEyZzFhRm92ZFU1NEsxZHFSbTlXV0VKcmNWTm1jVk5WZDBwM2JXTnVNbFpsVGxabVZVczFPVU5pVlV4RVltaElZMnhyVG1GcGVHcDZjVEE0WVd0a1VWQTVUWFJMT1hWWGFrSkJZalJYWlVOWmExRmljR1JDUzBWQ2NXWlpVRFZwYzB4UmIySjJTbFU5TFMxWWRuQkRhaXRCUWxKclZHMUZWVzFDWVRndlpIVlJQVDA9LS01YWJiNmUwOWI4MzZkNGZlNzlmMmU0Yzg0ZDYzYTBlYzA1MjY3ZDcw?cid=924732278#FDF
    • https://employeeportal.net-login.com/XYm5WVVVqQlpTbFZ2ZGtGR2FqWkliMlZzZWtNclNXTkNjVFl3YjJKSGQzVldRazlwVVhGWFVrZGFaVlZpVUZWRlZWaEJRblZ1YVhaM01UUjRkbTltVjBkSFkwd3ZVbEJPSzBZNE1FSmhSVk0yZUc1WFdsRTVRVEEyTUVKU09HNXlVVVl2YlRsdWRWRk1ZU3RGTjFSRmVtWjJVR1ppTlZSbmNtSmlRbVJEYkVscGJGbExVR2hhTTFWcFdHTkZjVVk0YldkVlQwVXZhRXhNVHpaWmIydzVPV2hZTWswdlptbzFWM2h2UFMwdFNuZ3JVRmRyU0hZd2RWb3JhMlZVUlVwbVRXcHdVVDA5LS03ZmFmYzg2YzdkNmQyM2M1NmNhNWFlNjk5NzAyMTc4ZWQwZTUwYTQ1?cid=924732278
    • https://employeeportal.net-login.com/XWkd3MlEwcENkMkpXYjJRd1dUUnhNVEo2VTBWeFN6RjJjRXRETjBSblRuUk1hekprVkM5U1dsRjJhbGwyTUdGeFJHWlFUa0pYZDJKRWIweDRRVVpMTkdScFEyTTJUMDF1ZUVkSWJETjJWMk5PYnpaMVEzTXhSbWhzV25oSlRFNUlaa3QzVGpRdlVtRldiVkJrVkU0MFkxSnhWa0ZxT1RGUE9HSnRVVlVyTkZGeFJXbDRNbEJTYTJWdlQzUTROVXBvWldsS1ExTkRUSGRxV0ZCQmFWRTNMMEZ6UzFrelpsVmFaVEJ6UFMwdE9HNUZjRFUyU210emNVWlRSM2xMVVc1a1ZGWmtVVDA5LS01OWI1OTQwY2I1YTVlYTIwZDdiMDAwY2YzOThmMjMxYjhkYzM5NDNm?cid=924732278
    • https://employeeportal.net-login.com/XY0hwU2VtVm5aV0l3WVRCWVVWbHpOMEkxVmprMlVrTm1aVFEySzFkM2VYUXhNMlpZWTNKNllqWnVlWEkwUXpKQlVIVldOaXRyUldrNVFUVXZaR2g1Y0dwRVNUSlVWSFp3Tm1rMmFrNU5LM1JGV1VFeGFESjNWbTlOTkZSMmRrTlhNMkYwSzFSMlRtdGhNV1I2TDFWMFNGcDNkVkEzWjBVellsUXlXR0kxWW1VMGRqTkJaVFZpWm1oa2IyazVTR1V6WlRKSlZUVnZNemxGWlZoNE0yZElTa2RUSzFWdldUQmFSRU5CUFMwdFpqRnVVM042TVhaTllXdHVNRFpSVkZCbFQycHBkejA5LS1mZWJjODIwYzJjNjBmY2MxMGU5NzljMmMyNGMyM2JiZTY2NzQ0YThm?cid=924732278
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
73d8c2d9b4c860404f3d25dbe8326fa9ba1395afad84b51a61c0b337e7fb5063		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 606 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
3d121054abfc5bbcfbefcbe7becc17de2639d006feea322abac0906bc34e87f1		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103746 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off00019667.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x19667 4575 bytes

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