Malicious PDF — malware analysis report

Static analysis result for SHA-256 a864aa0f9b5d57df…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: 1c7f796df037263ca3f580a7c1f6da12 SHA-1: e63a70b712145991a5b8d4917559d3bb4a613d82 SHA-256: a864aa0f9b5d57df865f265931ac9fa852feb6b21bf22784d514884bdd9ed278
160 Risk Score

Malware Insights

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

The PDF contains JavaScript that triggers a fake Adobe Acrobat update prompt, aiming to deceive the user. Upon interaction, the script attempts to submit form data to the URL 'https://webconference.protected-forms.com/...'. This indicates a phishing or credential harvesting attempt, leveraging a common lure to execute malicious JavaScript.

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://webconference.protected-forms.com/XYUdjeVdXNU1UVTVCU1dKdFNuaElWWE12VkhGMlJYVk5aemh3V0hkMmQxVldZbWx6VG5SaFZGVjFlSEYxVG0xc2JGQXZURVJCYzJacVVEWlFUM2t3U25SWlkzQkhXRlJIY0VJMlVIRnFSalJ3ZURoQmJ6TTVURkk0YlhaSldVOWFibTl4WldKc1RqZHBlWE05TFMxbVYxSTRkVUZFYTBObE4wUXliMmx4YzJGRk9GUm5QVDA9LS0zZjg4MjY4YTMxM2RkZDEyMjg5ZTUxOGJmMGU5NGMwM2U4ZWMzYWE5?cid=862130893#FDF
    • https://webconference.protected-forms.com/XUlVSM1pXNUpNMDkxTm1KR1ZrWXdPRVJqU2lzNU1rcGhNRTQwYUVKcmMzWnNlbTE0UVZKQ1NIYzJVME4zY0ZaV09EbDJVRWhVUlRWd1p6ZDVRV2hrUWxWcGNEbGxXbWR5UkhsbE9YRndRazVPUjJKck1FaHFkSEJZYldkRlZrRm9PRUZ4V2twTFRVWlhUWFFyYzNWcFdraEJVWEJ2ZFU1dVZWcGhNakZsYzNCbGJsTjRlblZWVUhGUE1tMXRibTh6V2tsMVIwMUdOM2hrWVVoRVdXc3hUVU5DV1VvdlZpOUZhSEZqUFMwdFQzRjZPRko1ZDFacWRuQXZVSEZPTVhJNWIyVTRaejA5LS1hMTlmMGJhNjY4YmU5ZWE2MGNlM2M5NGYzNmQ0OGE4NTBjMjE1ZjM5?cid=862130893
    • https://webconference.protected-forms.com/XSzFsamFXOTBNR3RCYkVSQ1ZuaDRMM0oxWldoa2MyMU1NREF4VEhoblpXVk5XbXhNY1d0cVJXbEZWSE5wYUVaUU9VaFhjRU5PTkZrMFNqSlFVbGxVV21FeldFaHJaRVJMVG1OaWNXVm9RM2hSTDIxV1RUUmlSVkV3TVROWmJVdzNPVGcxU1VGa2NFazJSMHBMVG10UlVHbE1OVWR2TDNCbVV6bDBWbWRDVlhGdkwyVXpiSGRCVkVGaE1XdHZMMGxZUWpSWVRHZFZVWHB3WTBobksxRjJMMFkzT1VaalVFRjZMMHBKUFMwdFNVVXdTakpMY0VsRVp6VkdRMVJWZHpoeFVsaExaejA5LS05OTgwOWM1MmUxYzk0OTVkNGRiYWQwODE1ZGM2OTY5MWE0ZjcyNTUw?cid=862130893
    • https://webconference.protected-forms.com/XVVVOU1NWUjVSVlpETjBwSk9EaGFSblZ1ZWxoNWRYUkdiRzB6TDBVNU1FZGFkMGcwTVVzM2JreHFTQzlVYUhZNFoybE9MMHhCTWpCelNWSndWV1IxVG5CVWJYQnlRWGQxWkZOYVZGWlRUMEUwTUhWUk5GZ3hXREJDU3pWdWQyMHJhMDAxZUhad1RVNVFXQ3R6VnpJMk56Vk5aRVZsYWxFMWIyZ3llR1p6U2xKSFowbFhjM2Q1YkM4cmFsTnFXVk54VURSMlZVbzBPRVprVDNCcE1YWndPRGR5VmpSb1ZuaDNRelZCUFMwdE1tUlpjMGRyTTJGbVVVRllibmxWU1ZaTGFVcHBVVDA5LS0wNmQ4YzE5MDgyZWNiNDAzMTdmZDVmYjhjNmZhZWIxMTQ2NWNlZjk5?cid=862130893
    • 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
87d4dc11675b0a2655c0d9677596d6a1454902e05e9946ade9074ab9f749d2fa		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 611 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
3be28796870118c9728598d9f83c63f3c3152f5517457e4e833f0d8e1a1e98e5		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103766 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off0001967b.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x1967B 4575 bytes

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