Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4ccd1820edd997…

MALICIOUS

PDF

107.3 KB Created: 2018-06-12 09:41:10 -04:00
MD5: e8bec351457804c7c2d9cd76e6ee339a SHA-1: 952e87a20dc715719cfcc04d3501e6d358872fba SHA-256: da4ccd1820edd997e45fc5313bedb696d5ef8d91ba8bcf6cc2b6106e95cdc5ab
160 Risk Score

Malware Insights

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

The PDF document contains JavaScript that automatically executes upon opening, displaying a fake Adobe Acrobat updater prompt. This prompt is designed to deceive the user into clicking 'OK', which then triggers a form submission to a remote URL, likely to download a secondary payload. 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://secure.sign-doc.com/XWm5JelNFVjZRWFIwVkVoeGVrWjFVeXQ1V1dKME5IcEtUWFJqWW5oaFpXaHdRVEZUY0ZsdU0wWjVTelE0Y2xoNGNERkRkRmwzTlRrcmVuVkhla0Y0U1RobU0xa3hOVUptVUhKTFRuUjFSRFZwT1UxR1V6ZG9Semd4TkRoSlJFbG5NVVpKVm1odmNFWmhOREE5TFMxU1ZXRndZVGR1ZGtneFluQmFSMHhyVGtSRFVUVlJQVDA9LS05ZmNmNWNlM2JmZjE1OWYxNDMwZDMwODJmMTQ5ZDVhNThmMDM0ZDk2?cid=73454165#FDF
    • https://secure.sign-doc.com/XWkVjeVVHWllkSEo0SzJWVVVUZFhkbm8yT0RsS2JHSnlhemszUWpoVVZtWlFkVk14TVZwWGVGZG5SMm8yTUN0dmNUTmthblJXUVVOc1FqZEVOVlU0WnpZNVRrZHRjMW8xY0ZsV1FYUnZVRW8yYkRNMWFFbHVPQ3ROZEVGMWJ6ZFZVVU5JTm5oS0swWklUMVpCYWs5YWVsSlVOSFpaUmxaSmVIVnlNVlV5VDNFd1NUbDNTbTFJVmxkYVVtUk1Nek5PY0RGaFZ6TTRXREpvYTJoSVZVaEJVekkyYm1vd01WWkhNblJOUFMwdGFuZFJOVWg1VDNaSVpVNUlXU3R2YlRaTlEwMVVRVDA5LS01NDI3ZGYwMmNiZGU3NGQ0MmQwMWYyYmFjZmE1MjkwMjdlNzU5Zjkz?cid=73454165
    • https://secure.sign-doc.com/XY0ZOUlJHWjFTMVpHY3k5UWVFWjBSbnBRVUVrMVVrVkZTSEl5TTFKd1FtRTRiM1V3YzJnNVMwSlhTRFUxUVZWVGNqbEtaR2xLTDNWWmNGZExTMWgwYlZWVE1VVnlZazh6UTBNd1IwdFFORUZCU1c1bFZVMXFZWFlyZUhwV1lUTkRRV2d6U2pZdk4xSkxSM0ptZFRCWFZUbDRVVGxsUnpJeGFERklUbEJ0WkcxaU5HaHhUV0puVWxobE1pdGpOMW92WTJOWk9WaHFPRk51V1VoNVVHMWthMjgwYmxKd1RYTkJlVmM0UFMwdE4zZHBVMUZJTVRSMGJuUnZWakZ3UW5ZMVYwTXJaejA5LS0xYWE0MDEyZmRiNzdlZjRkNzJjNmQ4NmZkNzA1ZDQwY2JhMjVhMTli?cid=73454165
    • https://secure.sign-doc.com/XUWl0Sk9GSXhOR0k1YUdkdmRtOXlLMmxwVlVGa2MxSjFSRVJOZVhsRE9HNW9jSGxoTW1wamJHTnVZV0UyYlVSMVRtbFVaRFJaVm1OUVJpdHNSemhNUWsxbGRTOTRUSGhHYVVaMkt6TjRaekoxTDFKS1prRmpRbUY1Yml0MWVYcENkM0prWmxKWFVuVm5WbUY0UW5CUlJHMVpOM0pEYzBWcWRWcFdRbEJvUzFCR09WTmlUaTlTY2xGdVoxWXhjbVJXZDNoVU5VczNTek5rYUhaa09UQlJRa2xaZUdWek5FRlFiR1EwUFMwdFJUSmlZVTFoTVRORFlrdEJObUl3VW1Kd2FuQk5RVDA5LS1kZWZhN2QxMzQyMDc4YTljZTliZGYwZGNkNDAzNzY5ODM3OWZiODYy?cid=73454165
    • 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
e4eb2885a385600aec2e9c2ede9617c96b86a840a1bfb5d951831fb985ff9846		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 596 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
8825a8f1d51887a2159d90c37c65c322e953fccb2bad381ffd3fee077f5a2422		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103706 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off0001963f.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x1963F 4575 bytes

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