Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1567dd643d8ced1…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: 34201a858447f7f5c3a7135b6b5becf6 SHA-1: 4cc07a302c521417f6e39e556611f72c5a0a552d SHA-256: c1567dd643d8ced1b855ac3a711907cadfcd3ad23bdc48a1220500be0e05e416
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 executes automatically upon opening, displaying a fake 'Adobe Acrobat Updater' prompt. This prompt attempts to lure the user into clicking 'OK', which then triggers a JavaScript form submission to the URL 'https://do.not.click.on.this.link.instantrevert.net/...'. This behavior is indicative of a phishing or credential harvesting attempt, disguised as a software update notification.

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://do.not.click.on.this.link.instantrevert.net/XUm14WWFuQkJXamhrVW1aQllrOWFhWGRPZG1weE56bHRPSEZ3VFRGM09EbHFlbmxSTjFKVVZrVnllRGR0YnpOSVdXNDNRM3BtWWpoWVdVVnhVMFZyTWpkSmJuSTNaak5zWm5Kc2MzaDFUa2RMUTJsdmJVeFFSa3RHTm1semF6VjJOVTgyVmpCRGNXMDJTREE5TFMxd1QwVkpUV2xKVnpneWJ6ZFhkMjV5ZFZWbldHaEJQVDA9LS00MDIxZjljN2M0YWIwYjk1OWE5NzUxYWJlOTNlNmVmMjdkYTVjZDNh?cid=909013634#FDF
    • https://do.not.click.on.this.link.instantrevert.net/XWW1ncmRHbHFkMk5NT0dsRWJGRjJaRVJuT0RaV05uTk9UR2QyVkhKcGRYRlFRMjR3UjNJNE1sVjVWbFpPVTJVd1VsRlJaVU5QT1dacVUzaFNiVkZJV1RGc1lVeG5ZV1ZHV1hONk4wVlhiVUV5TmtWSFdWSXlZM0J2Tm5obFNsWmlVVkYzTkRWM1VUZGxabFl6UzBnd1RVTjJMemN2TlVabmJUZFpkM2xOU3prNUwwbGxMMjR6TjBsWk5tZE1Na3BPTjJ4c1kzRnlRWHBVY1cxWVNVaHRUMGRhVURsWGFWWlRVM1ozUFMwdFRHNXpPRll4TTJWWEwwNDVPWFZFT1ZwMmFtVm9RVDA5LS1jOGYzNjYwOGJkODI5MmE4ZDRkNzA4YjNlZWZhYTk4ZDMxMDkzNzdj?cid=909013634
    • https://do.not.click.on.this.link.instantrevert.net/XZUVGMFlrSmFhV1F6YUZkSGJGWXJWMHhTZEN0cFYxUjJaRTE0Ymk4NU5tOVpXbkpPTVdNMlpXMTVaQzl4VW5Kc2FqZ3hlWGxQYTB0dFZtSjFkVWhwUTFONWJXMWhNVFY0ZW5WNVdHUm5XSGxIVTFsc1JsbHhibVprZVVSSmRYZFpha2R3VW1obU9GbHNRa2xaVG01SFZtNUJTVWhEYmtWNmFtWkxUWFYyTkhrdk5rb3dSVlJUV2t4UVRqQm5lR041WkZCbFlXZEhRbTkyT1hWU2RrbEdiakkzYVdGQ1dqRlViSGMwUFMwdE1IQnZUSFpqY0hkNVdFRnFZeTlqTTJrdmRrWnRVVDA5LS0xNTViNDBhN2RmZGYwZDFkNTA3MGRmOTczMmU1ZDgxN2U1OWU4YjY2?cid=909013634
    • https://do.not.click.on.this.link.instantrevert.net/XZG1zMlJFeHJNSGhKVjFkWU1uZHhOSGhFYUZoalJHZHdRbkJMTURRNFVFbElPV05MY1ZObFIxZzBPSFZaWVd0blZIUnBlbUZRZGtZMFdtNUdheXN4U2pnMk5GQnpXRU5sTjA5V2RrSlFWVmhIU1dSeFFqQldlalpCVTA5b05rRXhZakF3V1VodGRFcE9SbEpYUmpCdFNHMUJkR2hHUWtwcWJHa3hha1pwY1hsU1ptZEJPRGwxWlRoRmFIWTNWRVowTUV0eVpEQm9RbmQzVUUwd2RGRXpNaTkxWkU1NU4zaFlPWGhCUFMwdE1rWnJkRU5ZT0d0MlpsTnhjQ3R6T0ZCTFQwZFJRVDA5LS03ZjllMGQxYmE2ODI4OWI5ZDkxMWE4NjU3ZDBmYjA2YjExOWZmZDJm?cid=909013634
    • 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
77e318c6134c4c4f53593712e601a34dc181e8f12f1735787c99e981931c6f3a		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 621 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
b2455a6a5bba887806ea309a83d87bd9fc4cd2ddd880fb36a4c6b11386a570f7		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103806 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off000196a3.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x196A3 4575 bytes

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