Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70d00d8274a9e11…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: 72aabe0174132fbde2e49aa3d0a0f55f SHA-1: 310ef04ee91bc1a858384954f9bd74d32b6be03b SHA-256: c70d00d8274a9e113aebf4adeddea7340575e4af78be9d20736c933381c978b9
160 Risk Score

Malware Insights

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

The PDF file contains JavaScript that automatically executes upon opening. This script displays a fake 'Adobe Acrobat Updater' alert to trick the user into believing it's a legitimate update. Crucially, it then calls the `app.doc.submitForm` function, directing the user's input or the document itself to the malicious URL `https://web-login.malwarebouncer.com/...`. This indicates a phishing or credential harvesting attempt disguised as a software update.

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/XZEZRMWVtbDZNbEV2TTBsUWRuVTFUVU14TWpKQ1RsWkdSMDB4SzBGb1pUZG5ORGhDVlZwTFIweDZLM2xTZFVKR1dVdGhURWhIVEdKNVdGVlNTUzlZY2toVE9TOUhTV2MxTmxwb1JGbEhVRVY2TDFwU2EyZHRTR3RYUXpSVU9XaGtRVFF3Y3pWdUsycERjemc5TFMwNGVVaDZNbWw2WkdkR1ZUbHNRV0pGZUVWMGJEbDNQVDA9LS02NjIxZjI1ZDM4YzkxOTMzYTVhNzRlODFiZDg0YmMzOTk0ZTlkYmY5?cid=881492676#FDF
    • https://web-login.malwarebouncer.com/XUkhkVk9GazBXVTVIUTNWaGRrMU5LM05zTkdvcmQxQkxSbEJQT0dvMVFXUldhM1UyY0VWdlJYWktPVlJ4VVZSb1IwSlpaWEZJZG01UmJYRXJabXBFYWl0NFJ6RXlSbWhKYzNSdFZtbDJTVmt5YlV3MGNXdG1jMjFyV205R05FSkhhRkoyTVRKMGRtaGpPVFV2U1dzMVREZEJSM0JJZFdKR0wxTnZlR2RHY1hSRFlUTjZlR28yWkUxcU5tWlRVMUpNYkVSTGFsTlFNVGhSUVVSdk5FbDZZbUkxTWtsRmFHUnBVR2x6UFMwdFlVcEJVa3hvTVRnd05GSnNhMkZLV1VaVU4yZFFRVDA5LS1iYTQ2NjM5YWI1NDhmNTdjYmU4ZmMyNjM5NTY3MWRmNzgxMzA5N2Q3?cid=881492676
    • https://web-login.malwarebouncer.com/XVkRsVWJVdGxiVEJQY0dsR2IybHJOVUZFUW5keGJVTmFkazFQZEhOdlMwVnZTVGRPVEZkTFNVZGhjR1pJVFdaVlFYcHRiREpFTlRSVWFXcHhZVzFoUjBkdmVHbHRZWE5zT0ZOUWNqTkpSRkUwYm5GUE1rUnlPRzE1U1hkTmRsQjNiMGd3WjBNek0ySlVjakYzUkZGbUszQlBibXBFYjFkNWJXbFZVVVJFU0RCSE1VZEZPVzV4U2xSWVNFeFpNMkZ6TTNaamMySXhOWEp0VXpJNWR6ZFJaa1JqZFRsRGFtazVjVk52UFMwdE5uRnRPRmd6WWk5TGVHOTBNbXQ2YVV0YVdEVlFRVDA5LS1jN2IxYjhhNWY5NjdhZmRiYzM1YzJjN2M3OWU5NWU4Y2RiNzdmOGUw?cid=881492676
    • https://web-login.malwarebouncer.com/XTmxwb2JtRnNaVzQ1VmxWWFVpOVJaVzR3YkhGbVYwVlRhVVpqWTBFME1YRm9RMWhqWVhVNVZqbEthME5sZEdodlkyNVlSV1JvTHpGd1kwaFJMM1ZzUW5OUFQzVnNZMFpIUjBWeGRqZEJXbFIxWlVRelNFeGxkVGREWm5Bd2JWVXZOblpEWmxGR1RVd3hhWFUwVXpGM2RFUTJiV1lyZDJWNVJYSjJlREpJZWtJM00wSnpSVzR3TVVVeldVaDNOVXcxZUd4dWQyNUdabGRzYlZJdmNUVnFhMXBpT0d0blRUaGFWaTgwUFMwdE16Tm9WekJQZERCc1kyTkplVmhxTW5SeU5scHhVVDA5LS01MDcxMmE2ZTMwOTcxNDQyYjA4NmUyNDg3ZGZlNGZiYTIxODllZjAw?cid=881492676
    • 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
c2628c225a3f20ed33c475b1a2fa11acd9f8d7cd8a8546e09d9bbb4aed4732cd		 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
f41becbd2be786f77035561a114861c5d1d278abf308007a35b4467b91dbca45		 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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