Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0bb6f02b40f9ce…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: 73863b90dfca1f791c5c2847bfaf8555 SHA-1: 7e9845b74dece0eeb79fe7c4f0c14f4cad633402 SHA-256: 2c0bb6f02b40f9ce393144fa86092592625792ae9c85c2b91b30db07033cbe78
160 Risk Score

Malware Insights

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

The PDF document contains JavaScript that triggers a fake Adobe Acrobat update prompt, aiming to deceive the user. This script then attempts to submit form data to the URL 'https://dontclickthis.knowbe4.com/XV0ZSc2JXOXhSeXRoWVN0MWFrNWhLMFZDUTJacVdtMDVaalJtZEdGWVNHeE5jbmhqSzJsa2JIUmxObUpNVTA1bFNYWm5kV2RSYm1vMlIxWlhjVWhxWm5oM2NWTlJjVGxyVVdkRmNtWlNkSEZ2U0RGa1VUbG5URTlRZG5kNWFrTjVlakJEUTBoaE9VaERNMDA5TFMwMVpqUjRhVFZNVDNrdk9EUlNMMkUzVkd4WlozUm5QVDA9LS01ODA0NzBhNWMxOTRjZjhhZDcyOTU2ZTBhMTA3Njg1YTVmNjk1ZDRh?cid=885720095#FDF'. This behavior is consistent with a phishing or social engineering attack designed to exploit user trust.

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/XV0ZSc2JXOXhSeXRoWVN0MWFrNWhLMFZDUTJacVdtMDVaalJtZEdGWVNHeE5jbmhqSzJsa2JIUmxObUpNVTA1bFNYWm5kV2RSYm1vMlIxWlhjVWhxWm5oM2NWTlJjVGxyVVdkRmNtWlNkSEZ2U0RGa1VUbG5URTlRZG5kNWFrTjVlakJEUTBoaE9VaERNMDA5TFMwMVpqUjRhVFZNVDNrdk9EUlNMMkUzVkd4WlozUm5QVDA9LS01ODA0NzBhNWMxOTRjZjhhZDcyOTU2ZTBhMTA3Njg1YTVmNjk1ZDRh?cid=885720095#FDF
    • https://dontclickthis.knowbe4.com/XZFZZclVreHdWVFk0VUhwNFVVNU9WSFE0TW5GWFNtdG1hMVowZERKdFZXb3ZRMFJXTTFGSldtbDZkbGMwYmxkT1JURkxNRmxpWlVoa01tSnBhR3QzWmk5TFFWQnlTaXRCUmpKWVN5dFVkM2h5U0ZOaldWWkVRVGczTDI5MWFuSlJOVFJ4VjNOU1MwbFlReTl6UzNSeU1VaFNUakY2WWxSdldGSm1aVTAwVkVwRVkwRldVMGROYmxKamNXUTNlakJKYUcwd0wzVXJUa05XTDBoemFVOVFlbWhWVnpkc1VGRjJRMVpuUFMwdGJVWnlMMGRLVVhGNVVtNVVSa1ptYVU1MFlubHVRVDA5LS02MzE4NDE5MjcyNjkwZjJjNjZlYjMyNWYwZjI5ZjhlMGU0ZDA2NGY5?cid=885720095
    • https://dontclickthis.knowbe4.com/XU0VwalEwTmlXa0pNUjJoVVYyRnhXWEpLV25KNFRFczBaWEpYYjFCc1JsQkRjVlZYUVRsWU1XbzVVeTlRTUhac01EbEZTSFprY25aR1l5OVBWbTFTVWxZdlZrWlljM1ZUUVZveVFsZzRUMHBzYTBkc1dGVjFNVzg0YjBoS1NsVlJVekJYWjJ4MlIwTkNWMFIyYm1VeU0wWjRWekJKWW5CMk5FSTRRWGt6WXpkVlNsTjFZVGRMWmpKeFkzYzNkM3AyVEhacWFsRm1UamN6YkdKMVZtdHhjM00wU2tsQmJ6ZFFPVXBaUFMwdE0xVlNVWFpuZUdacU5teDZhbkpEVkVNclEyNVZVVDA5LS0yZmJmY2Q3ZjYwNWQ1NTY4OWQxYmVjZWFiZDcyZGNkYzQwYmY2YmIz?cid=885720095
    • https://dontclickthis.knowbe4.com/XZW5oNmVTOXNRMHhNYnpWS09YTkdNRkZoWjBOWVpuUmpkUzlLVlZSTVpUbHdlVFpMYlVOSFVXaDFVWEJMVmpKT1RqQXJlVlpzYm5KcWJuRkJkMHcwWVdJMVdHY3ZhSEJhU0VkaloxRTVNVGRQTVdoUWRGRXJNV0Y2Y0Vabk9ITm1iR2wyWVV0dVNrUkdNbWxvU0dSdVUyNTBkakpwTTBoeVIwdzRjbEpqTlVsMlUxZEJlVzByWVdOVU0yWnFSaXN2WmtKbVdIRnZZekZMZDFjME5WQmtOR1U1VUU1U1FrWktkRmR6UFMwdGIyeERZVWt6ZWtjeVVUVTBkbUp3TjFWaFVtdGhRVDA5LS05NTQ1MDk5ZjMwNmY1ZmRlYzczNDJjYTU2ZDgyYTNmOGIxZmFmYzFi?cid=885720095
    • 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
9a88576fd70dd003ed4d6028f0b83e73257d54026b3e52f4ea4068547350be31		 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
e72f45b22e3b6144fdb0fd60c4b0faa48cd6e03b6b22d4cc23febd971d793342		 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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