Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec59fa2b0f69257f…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: d5503c52bccb2ff0eb17dfdab2d2ae61 SHA-1: 5390e3525d0a2cfd6f842a7ba0ce96f48d7d11e2 SHA-256: ec59fa2b0f69257fb6b7145367eeec1d1eb88cb6251f9bde387a1cbfbd4b1666
160 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that executes automatically when the document is opened. This script displays a fake 'Adobe Acrobat Updater' prompt to the user, aiming to deceive them into proceeding. Subsequently, it triggers a form submission to the URL https://dontclickthis.knowbe4.com/XZG1Od2NGTTJVMUJ3Y2t0bFZTOHpSbk55T1hGdmJtZFFSME5DVDFrclZtUnBVWEFyYm5OU1RtbE5UMGdyUzFKVGQzb3daMUpETVROa2JXOTBPVzFHYjJKekwwSmhWblEwWkZaSGVsRlFVR3hKWWtwYU1ETllSMjhyT1VsSU9VZEJNblZTV25oa2QwZHZSMEU5TFMxeGMzRmhjRTR3VGxKelF6UnFUemhMU2tGWVozUm5QVDA9LS0xZmJjOGQ3YWM0Y2YwZDE5NmY3YzBmMGQzMDI0NDU5MzFhMTIzMDJk?cid=885720397#FDF, likely to download a second-stage payload or exfiltrate information.

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://dontclickthis.knowbe4.com/XZG1Od2NGTTJVMUJ3Y2t0bFZTOHpSbk55T1hGdmJtZFFSME5DVDFrclZtUnBVWEFyYm5OU1RtbE5UMGdyUzFKVGQzb3daMUpETVROa2JXOTBPVzFHYjJKekwwSmhWblEwWkZaSGVsRlFVR3hKWWtwYU1ETllSMjhyT1VsSU9VZEJNblZTV25oa2QwZHZSMEU5TFMxeGMzRmhjRTR3VGxKelF6UnFUemhMU2tGWVozUm5QVDA9LS0xZmJjOGQ3YWM0Y2YwZDE5NmY3YzBmMGQzMDI0NDU5MzFhMTIzMDJk?cid=885720397#FDF
    • https://dontclickthis.knowbe4.com/XYm1WS1UwUk1WSGh3TVZsMFVFZGtRblJ0T1VORU0xTTJOamR6UW5nNFZqVjRXbGg1S3pGUVptRmxhRVlyVEdaUmVVRnJNblF5VFVrNFpqRjZlV1F3VjJrdlJWQnJOemcyWjFKaWExWnRTblZEUzA1SFVERkxjbTgwTm1OUE1YbHdXRGhoUVVOM1NIbzJUWEJhZVdKVE5YUnNkRkJCUVZCeFN6QXdTVVJxUW1wV1JsbElaR2hEU0ZKdVpqSnZTR05CYVUxNFJtbFNTMnhhYkROamQxTlZjM2RHYkdnMWRXSm5XVmswUFMwdFYwNTNOVEZ4UlhOeFl6ZFhjVTF6ZWtJMVRHWjRRVDA5LS0zZGIyNzNmZGY3YjllNTA4ZWE1ZTMwMjc3Zjk2MWYzZDE0MzFiNjRm?cid=885720397
    • https://dontclickthis.knowbe4.com/XYUhsa01HdDJkVFZOVlRoSldqVXlkaTlqY1RjMmMzZFNabU5GY3pWc1pXeFZPVFJGYURCdWVUWlFOM1V4VkdKeE5ETktSRVpWWm1WRUwxcHJNVEZEVWxaaGNXbzVUbXhwTkZCNUwxbHlUMlZRWWxkdWNtUlhSV296YzFwWWVraHpValp1VmpZdlMxTnlORzQ1ZG1KS1MyTkJWbWt2ZEhwRFRtZFlhRTB3UzBaTWQzRkdVV2RGWkRGd1Z5OHlSa3BSWmtJclNuZFdVemhNVlZGWlIybFFlRmhtVWlzMldTOHpaalozUFMwdGNERnRlbkoxVmxWb2NGWnFRMnN5WWsxNlJ6Tm9kejA5LS03YWIwN2ZhYmE4NDdkMzkxZTQ4ZGNiMzQ0YTA2ZGZjYjFlM2U4NWJh?cid=885720397
    • https://dontclickthis.knowbe4.com/XV2pWM05XWmhkVGw0YVd0T0sxcHlTRWhRYzNGM1dFUTBja1pOYUhweVlUaEVVRzlhUVZwR1QxTmFkWHBXV1RKaE1YUTRPRkl5U1U4M1JsWnVWMlp4TVU1VVVFSndNVE5CZW01d2RDODBLM1pwZWtoVVltTjJMMXBLTmpGbFNrTXdiVGhMUkdSWVMzaHNWM2c0VFhCTVp6SkxkWEZXSzNjeFNqaERWa1JGYzFkWksxWm9NSFpXVDFWalZHeHJlRlEzUWt4V00zcEVkWFZOU0ZadmIyTlliMHN5YTA5VWJUVjFabVJyUFMwdFQwZG5XV0pMVUUxd05UVkRPSEIzUjJjeFVGWlBVVDA5LS05OTRmYjA3ZWM3NzQ0NDU3Zjc1NTdmNjAxY2EwMjg5MjYzZTk2ODQ2?cid=885720397
    • 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
3b8a235505e70bebee81e32bbaf9ee059a6e02b3186d75617991b9d7b988eba4		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 603 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
304c66ef8c66b146f7a8de5fa5edde3e39a348de5d1867cd2171479cc88bcd07		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103734 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off0001965b.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x1965B 4575 bytes

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