Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dc619a23072e86…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: 31026fc8949a3b76192f6218836ef4d9 SHA-1: 3d030000adff9da3280de150ce280f824580f5c1 SHA-256: f1dc619a23072e86503ace712e5f409e30ef763c70a168ca261bf0e429af7d30
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, aiming to deceive the user into clicking 'OK'. Upon user interaction, the script attempts to submit form data to a remote URL, likely to download a second-stage payload. The presence of JavaScript and the fake update lure strongly indicate a malicious intent.

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/XYUc4eEwxbzRVR3BZY1VoNlZqRktXRWhRU1dwblkyWlFZV2xYZWtaQ1JrdHZlR3cyY25aUkszSkNMMGd6VTNsc1puSmljVTFLZDNGVmIwOW5OeXN2SzA5aFRXNXdOV04wWmpsdmQybDBOemhNYlZGdFRFTlhSaXR6UmtJd01VcHhSMWREZVhkNGFqZzFlVUU5TFMxTWN6SmxibkpoWTNCRVdXd3hWMkp1WldSek1rOW5QVDA9LS05MDFhZWQ4OWE4YWM0MmYwNDM4ZWQ2MmJkNDIzZDViZjUzZGYzNDIy?cid=898850477#FDF
    • https://do.not.click.on.this.link.instantrevert.net/XUWpGUU1XRjZNQzlEVkd0T1RWVlVUSE5zWTBsbFRsTm1OVFV3T0VoSlRuQnRaSFZrZUdjMlltYzNkVkoyTkhnd1YxazVUelJVYWpOQlpWcGtjWGRJTm10WVlVbDRTRU0xTDNoQmMzZHFSV1Z2VkVsNmNFRTVjMHBsZVhCeldXWXhURkpuYzNGak1WazRiRzFWUVV4U2JUWlNhMVE0TVN0UFJuRlhPSG80WlhCUVMyZ3hhemN4ZDFObE9HUlFibkEyYURoQkx6TnVTVVUxWW0wek5GSlNkRmxWVkRCM1JYVlNSaXRuUFMwdFVURkhlakkwWlU1WFZ6bHNSbms1VUd0RlV6a3haejA5LS0xNjhjMmQwZmYzOWEwOTM4YTZiNjY2ZDllMWRlMmI0ZjViYzdkNDk5?cid=898850477
    • https://do.not.click.on.this.link.instantrevert.net/XWW1wRllYaFNNREYwVkU1UWRFZzJhbTF1U2pGMWR5OHlRU3NyTTNsbGJHWXJibkJIWm1nd2JXaHNPR1IyVVVsNlZVbEtXbXg2VkROeWEwUk9PVWt4WTA0clRGbFRka2QzTlU5Q1ZDdDJVbnBvWWk4eVUycFNWSEJGYW5kWGVuZHpiVGxITmxjdlQyRmlTV3hMWTJOMU0xcDJkMHRvVUZwVmEzUTJTRmgwTTNKdFFUZG9aVlF3TDJsWFZGRlJWeXQzV2k5SFQxaHFObEoxYjA4ME5Fb3hhR0ZTSzFGTFlYWlVjR0kwUFMwdGVEQXhZVnBCVHpOVGRHSldaek0wZVdsRVV6bG1VVDA5LS1iNmIwNGIxZDVmNDY2MTNiYjFiNjNiMjFkMTJkM2QzNGRkZTc4YzA5?cid=898850477
    • https://do.not.click.on.this.link.instantrevert.net/XWm5oMGR6aDFjVk52YlUwellWQkdRelZvYURVeUwyRlBOMmsxZWl0NVMwNXRSbEYwWW5kUldHRnpNbW94Ym5WTmFDOWlkMVU0VUZNNWEzZDBVR1JxUVVSVVFsUnJNbU4yYlZaRWRuUkJla1kwUW1KYWVGQmFlbUp5U0UxeU9YY3dZVzgwV1RGUVpGRktSMVlyWlhsYWQzSkxXa2RHU0ZVNFNXTnNZVlIzVkZwMFlWSmhTbGh5VDI1QlZqVjRPR2ROYUU1R2QxaFdiazVyVWxsaloxaHZXR040VFU5emRuYzRSRlJ6UFMwdE0weFpiWFZ0UVhSV2FGZHJMMmRZYTNaUGMxSlVaejA5LS0wYmRjYTJhNjJmNmQxMzNiNDIyZDJjNWNjZjkzMzZlYjIyMDkxZGQ2?cid=898850477
    • 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
e42810e560cf6023a2b0a8bba25e110ab9502eec9bff4349139ab4d0090f26d5		 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
47972aaacb7d56e72701bdb2aaa855769204ff505f9771d2b32cda2dd348c44e		 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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