Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fa26061c7be89f…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: d027498fdf391e467d401c14638d38e0 SHA-1: a166b021af185a85343dba6b9d121b3f4b2de6df SHA-256: 75fa26061c7be89fd2e4ef372ec5b30ffcfae4ba0773dc1f4fae8faadbb13884
160 Risk Score

Malware Insights

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

The PDF file contains JavaScript that triggers a fake Adobe Acrobat update prompt, aiming to deceive the user into clicking 'OK'. Upon user interaction, the script then submits form data to a malicious URL, likely to download a secondary payload. The use of JavaScript for execution and the deceptive update lure are key indicators of this attack pattern.

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://chase.com-onlinebanking.com/XVlVsRFNVSjFXRk5MWW5SS2N6bHVWMlYwZDB3MGJVMVlZVXh6UW1kV2N6aEdhV2R6YlhkUGFGQlNVMlF6WVZkTmJEazNMekpQV1VKTWMzazJibXN5YmxOTkt6aHhVbUp2WWxoRE1VdG5hM1paZWtsWmRVOVFibVI0U0hSMWFWSmhSMGMzVUhwelMweERSMWs5TFMwMVJVSjBZa280WmtKVlpqTkpjMkY1UXpKcWVrRkJQVDA9LS1mZmViMTRlYzcyYzQyNGRiNDIzYjk1NzhhNzk1ZGZiMzNiZjFjNGY2?cid=898620438#FDF
    • https://chase.com-onlinebanking.com/XZVhBdk5YbGpOVFZrTDBwamIyWnVjMXBvU0daVFNXUkVMeXRET1c1bVJVZ3pSV3RhZGxOTmRFaDRlamcyZVhjcmJqSmtSRFF2U1d0UE1WZE5hMEYzVERaUmRuaFljSFJrWldwc1dsZ3JhRGR2ZVZKd1JqRkpVa1Z3YmtsS2FESXZlbUZKUkVSeE5IUnJhMHRIYVVSUGFXeGxRa1pKZW5wTFdHRlFSM280U0hvNWJVbzJPRFF5V21OSlpHVTFPVFpDU0Vsd1RURnhTVU5QWWs5amIzRk5ObVJRVW5SNGFYZFVVMVJaUFMwdFVsZERLMU5YYWpkVGMzWk1iR3B4YVdabWVsSlVkejA5LS00MWUxMTg3NThiNGQ1YmZiYWQ5MjQ2OWUwMjk2NTdjYzVkZTZkYWNl?cid=898620438
    • https://chase.com-onlinebanking.com/XTlhKb1RGTTFhVk4yUWpGdVlUaG9XSEpqYUdJd1ZWVXpVRllyWkhwTk4xVTRRV0pVV2xGWldGcFpUak5oUVdoS2JWWmlXR3RTTVVoNFNVZDJaMlpFWTJGeksxZGpXR3Q0Um5OeFJVbFZlWGxuV20xQlVFbFJLeXR6U0U5QlJuVjRWMjlKUzNCS1RVMXRXSFpoWkZkR0sxaGhOR1JWTDBwbFFrdHpSVUozY0dGSlprVmhUMHAxU1cweUwyWkpWbk5UTVZaVVZFdFlTSGR1YnpSSWJISm9OSGxvYldFNGVHNVZZa0pqUFMwdE5HSmhNVnBMZEVGMk5rZFlkMmtyZGpkbk4weFlaejA5LS1hZGY0ZmI4YTBlZGI4NjE4YTFhY2Y5ZTBlYWU1ZmViZDVmNWUwMTU3?cid=898620438
    • https://chase.com-onlinebanking.com/XTm5wQ05tWTBRMGx6WkUxNVFsbEhha05WVmxkRGRrWnNTR3BaTVROWFZ6aFNTRUUxYVc1V1ZtSkVkbFJLUVdORlNGUTRTR1o2WmxwVlkydEZTVzFzY1daV1dUUldTbUU1YW5SNWRHVkNOM1kwUWpkWlFVOUVMMGhzY2tveVRVSTJXREIzYkZSVVNGUlBSVVo1ZWtKQ2IxcGFlSHBzU1VGc1NVcGpOblV6VEV4b1FrRTBPVTEyTTJKcFMyUlJaRTF6YlVOeVdrTndRMkUwVGtoaU9XNU1NbTlrTTFsWmNGbzJZbWxyUFMwdE9FbFphWEpZTWt0aWVFWTJXbkJ1Y0VocFVsSk1aejA5LS0xNjdlZGFjZmJhYzJhNTMxMjEzZmMwYWYwZmE0MzE3MzFkMzY5Njhj?cid=898620438
    • 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
2280d7f6af02e4a6e5fbb928341c9efe181cfa27b07205ec99b539a0f4081381		 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
849ea032a96a193be5fca7b7b80c768cca68e6078f0b91fdab5707efdfdd4397		 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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