Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dbc454ca9f3fcb…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: 4c2297df0708dac32ff9fa9c0de93387 SHA-1: 9cb0f655f427ed22c3c974e7b24f6de2dda0a561 SHA-256: 12dbc454ca9f3fcbecebb75d37c5864a81b6c5c8de51263194e33b6978291d7c
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 to lure the user. This script then calls the `submitForm` function, directing the user to a malicious URL. The primary purpose appears to be to trick the user into interacting with a malicious site, likely for credential harvesting or further payload delivery.

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://web-login.malwarebouncer.com/XVG1aQ1dFRkNTbnB2ZG1wQlpWVkdjME56TTBka2IzVndaRWRrVWt4QlIxQm5LMWcyTTFwR1NHbG1la1JaV1UxcVJUZHlURzFVT0dOSVIwOHZSR3hhY0V4NlJrcFhZbmR3YnpGcVJtaDFkMlJKT1ZGdVlVdEJUM0ExVkVodE0zUjNURUpGVGs5RmQydEljM2M5TFMxSmNVbERVVFp5WTFkSUszbHNNeTlFYkRWdWJrUjNQVDA9LS0xMDc0NzM0MGVlNDdiZmMwMWY2YmYwOTJhYWYwOGI0NTU4M2M5NTZk?cid=902866127#FDF
    • https://web-login.malwarebouncer.com/XYlVObFJWSk9hMEZLTnpWck0xUnBSRTVIWW10UVIxaDZTWFkyWlcwM2JHTnNTRkZJTkUxS1JtVkRSWGhTVVdVM1RuaFdVR05ZYlZWTVdVZzROWGgwZFhkRVJWTkVZelZXY0d0V2QySlVjamhpYXpOVVJsTnZaRlpoUWpKRlpFOXZLMWg1SzJWb2QzUlBVRkprY3pWSE0wbG1hbXRDUmpkeGIwaHRheXRLVFZWSVEwdEVTRzVqUWpWb1NscHZNMlk1YjNGR2VVUjFkQzlaWlVKeGVHSnVOamR3YWpkWU5YaFhjbU5OUFMwdGRHVndXVFJvT0dSaFlVeHphbU5GTVVneFdISm9VVDA5LS0yY2NiZWI3MDU3MmNlNGZiMDVmNjgxMjdmMzc5N2VkMWEwNDJhNWZk?cid=902866127
    • https://web-login.malwarebouncer.com/XTkhJNGFITTRSRmRJYlhWTFdIY3hNVlJ0YTBsR1dUY3ZhREZ5ZGt0bFQzQlhNVkZTZFhsb2JHdERZWFZGWWsxQ2FFWTJZMFU0UWpZNVNEbHlWVFl4WlhCV2VDdGpPRGxLVW5saFVFeG9ibVpWWVVGRlRXVjFZV3hyUkVWbFJtcFpUMDVzTWtRelZuVlVZVkpEVld0MlVYbFJOMXA0TkZGYVIza3pVMjFSZVdJMGFqaDNhVXhQYTJKblZsSk1UbFI2UVVaa1FsVTVhRk41ZFZKSVJVUjZjRWhTUlRsVGVFMURlVVJqUFMwdFdsb3ljRXRYT0NzNVFXOTNUR2hpUmtGRGNVZEVaejA5LS03YTM2ZDE5MGUxMjkwYTgzYmZkM2E5YWE1YmU4MTdhMzE0YTYyZWRh?cid=902866127
    • https://web-login.malwarebouncer.com/XVjFaMWNtbEVTeko0WlVwV2Jta3pUVEpxWm0wemVXWm9TMk5yVlhaa1ZERXdhM0pZUWtwYWVWSXhMMEZMWTNKdFlrTnpjR3NyYldsMlVFMXpUR3RNTm1KUlRYQm9kVWxvUlZCR1FsUkxMME5KYzBwc2NtOXpWVlpwT1N0S2JsRnZTWHBQYUVwV2J6bEZUWFUxWmsxbVdFYzFOMGxQVUVWS05VVlBNVzEzVVRKdFZWUnNUbmhGVEdoUk1tcFRkbFJKVDNSd1drSXdVM1p4YW0xdlVtUXZSRkJSV0d0bFFtMXNNblZWUFMwdE9FZFlNUzlRTlRGa1MwRmhVR2w0YURWclZ6RkJRVDA5LS1jZDQwMWE1MWYyZDI0YzZhMzJmYTEyMjhiNzU5N2RlYzgyZTMyYzIx?cid=902866127
    • 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
1eae8b3db49f15dfb2eb5775c191d4926b060e0b3eef9419818d96d9a8aaf836		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 606 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
a1e3474d9ff68226636621f252f7466d40042afa4e683fbcfefb2303da8e61ce		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103746 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off00019667.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x19667 4575 bytes

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