Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cea7681d56c00d…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: ed14f745c2bcd490733c907dcb66be79 SHA-1: 5f27648168938a7d09acd9daf0a7e5b201add9e1 SHA-256: 54cea7681d56c00d8f1fea53463237f42cc7dc08e57dd5a3ac0e7c3b4acd9617
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF contains JavaScript that triggers a fake Adobe Acrobat update prompt, aiming to trick the user into proceeding. It then executes a form submission to the URL 'https://Covid19.protected-forms.com/...' which likely leads to the download of a secondary payload or further exploitation. 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://Covid19.protected-forms.com/XZEZKSVFYcHdZMngwUTBkVE0wbDRaVTlvVlZGWVpUZDJXVzQ0Um05Q1ptNHhkRmRZUldSVloxa3lhMWh2TUhWNlFqWnRZM2g2ZFN0VFJrRm5ibXRDWTNWdWVGQllabk16WjFOWWFubDBaVGgyVm1kV04yOTNjRms0ZHpCVVNqRnZWbFZHVmxsdlRtaDRUR005TFMxVGVHdHFUR3d2WkRSVllYY3pjSFJOUmxjcmVIQlJQVDA9LS02MWM1OWYzNzU5MzMyYjU4YzVjNjc3ZDIwMmE3MWY3ZDY5ZTQ2N2Q5?cid=906433973#FDF
    • https://Covid19.protected-forms.com/XTlV4YWVIVktPRnBOTVVOeVpHYzFOMGN5YkdaQlpXWnlhVEZXZURKbmFWZHZRekIwY2t0b2RVTmtZbUpHVkhRMWFXcGFRbnBtUkZad01rdHZWU3R0WTFjMlJUaG5SbVpoUjJObVpWTlRlQ3Q0Y0NzM1kyeFdSREVyYm05T1FUUkRibmhVWm5oaVdYcEZjWHB4VTBoUFJtUllVMkZ2V210eFUzSjBVM05QUTBGemRFcGFhbEZUUWxOaVNVZGllRmxaZEVvMFpIaE5lWEo2VFdOU0wzVk5aM3B6U2t4V1ZuUTVjV1JCUFMwdFIwOUlNVXN6TjIxVVUweHlOVXhPYzB3emEyOVlaejA5LS0xOWQ5ZGM5NGYxNTFjNzMyMmQ5YTZmMGI3ZDY1YzZiODAwZjRlZTU3?cid=906433973
    • https://Covid19.protected-forms.com/XUVhObWJubG1UbFUwZVVkMlMzaDFjbU4xV2tzMlJXa3dNV1ZqZVRSWE9GSmlXa1J0Ym13d1VsbHphekZLY1RkRlJuUnhlbUpVTm5CaU0xbEtNa3RZZUVvelJDOVVUR2t5VlVVdlZpdExUVFUxUVhOR1MwcE5Oa0Y2Y0ZGeVpGcEhSall5TVdsaFVqaEhSMUE1WVhKS1owOXhUakJwVlZKbFUxQnRNM1JRZWpVclZGZElRWEoxZDBnMVFtNDJOMHhaUTNCMFVWTktlaTlRWWpkR2FEQTJXVUZpVWtkcGNVVlhVakpWUFMwdE1EaHNZbFJRWlRRd1ZYUTFWRU5QU0hKcmRrTnFaejA5LS02NzcyMmEzNGYyMDE5ZjEwNWY0OTk0ZTdhMjZkODQwMjAwMTQwZmYx?cid=906433973
    • https://Covid19.protected-forms.com/XTHpOMmVEUlVTRGx4VlhWMFNXTXZVeTlHV1RJdlJHRndMemhhZVc1TE5uWm1hWFJxY0hkWGFYa3lUM0ZGWlVOdU0zaDNPR1YwUVdGcVprbHdiR05QU0haNVZERnNhMHg1UnpKbmRHTjZkMDB4T0hoWU4wcEtSMUp1TXpVNVpFbEZTbE41T0RSNU9HdFBVSE5IYkdjekwwZGllazVJUVN0bGNWRTNVR3RwYjJ4WVQzRkJaVzFYVjBWSVVuSlhZMUprZG1veGJtWXJkamR6VTJoc2NWQlZSVVpsVVRSNWRVSTVOVVp6UFMwdE1tMW1ZbHBzT1VkRFlYUlZVMHN5TWxGSk1EWnBRVDA5LS1iYzdhYzQwMTNiOTdhMDg3N2M4ZmQ1NWM2ZmZmZTdiMDMxMWRjOGMy?cid=906433973
    • 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
ab8a7d68b9236ad66a98fbfb9e2a5fca898ec1a0b06571bcdd8e1d7530b97479		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 605 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
b562814ce431b4c3b635d8b4472a420a0d84090d1833543aad70acc488c7ab5a		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103742 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off00019663.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x19663 4575 bytes

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