Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdaa632358bc4c8b…

MALICIOUS

PDF

107.3 KB Created: 2018-06-12 09:41:10 -04:00
MD5: 98a49c6af7937537492c58a5834eb5c2 SHA-1: 909f1cc72e7ed07335629cfdb5a6b7d367e5042c SHA-256: bdaa632358bc4c8b03f9fa50b9544428a1aeb5d0cb2f4406b61ce50985433c0d
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 automatically executes upon opening, displaying a fake Adobe Acrobat update prompt. This script then attempts to submit form data to a suspicious URL, likely to download and execute a second-stage 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://addto.password.land/XZVdsNlJHRlJSRmhDTWtsSVdFOUJRVTFOTUZCNFFsWlVkMVZpTW5KTWJsVTRSbTFZU2l0R09Fd3laMFpTZVdWR2NsZEhPR1JTVTAxNlZXWk5TMmh0ZW1nMFZFRlFLemhVWVM4elowSkNkR3BGUlU5d1lqRjNNRTl5VldKbVRuaHRlalZXV1ZWTE55dHpjRzg5TFMxV05WQjZSVTk1V1UxWUt6QkZXV3hxT1VGa1ZYTkJQVDA9LS1mMjQxNTQ3NTY1ZTU4NWE4ODUwNWU4ODc3YTM0ZmViOWE1MWVhNGQy?cid=913804783#FDF
    • https://addto.password.land/XV1RWb1ZFWlpZMDFSY2pOdmRWSlVlbXRwZERSWE9FVnhZbGxDVnpndmFtRnljRmxQZFdKRmIyUm9XWEYyWldnMFpXUmFOMnBGYlN0SFRWYzNaV05tVVZWU04xQTNlRmhtWVhRMFVscDFOMnhFYmpNek5HMW1SVFZXT1VkVmFFazFLMUIxVVVKVE1FdGxLMGhHVlRCNFpUSXJTMDF0U2tkeGFEUjVTMjlpVkU5clZUQjVNMWxPUW1OR0wzZG1Sa2RNUzBOSWMzVnpUbWw1UVhkdk9XeGpRbFI2VVZka1lXVjFibXBGUFMwdGN6QlhTVkpwS3pZM1FVMUtSMjVaYlV4UWJtOXJRVDA5LS0wNjliNWY4OGNmN2Q1YzczMWJjMTNjMTMzOTk0NzhiNzQ3YWFiNDQw?cid=913804783
    • https://addto.password.land/XUnk5YWFrSXJaek54VWtVdmNIVkZZemxaTlZWalF6Z3laRFJ6VEVSTk9HZFhPV0ZxZEU0NFFUQTNaWGMyUzJKTFdEWnJVbVV3WkRoV1JXYzVNV1JCY1dKNllYZFlPWFZUV0VoT2NqUjFkbU5RWWtadmJuaDZWM1JDUXpoWFZTOVFiR3B4V1VsclFWaEVjUzg1ZWpaSVFXcDFjMnRMYVVoeWRHdElVVGsxWW1KR0swOXZNRVJIUWt4T0swdE1OekprUnl0eFZuSnFWMmdyU2tGQlV6WkJSVEp0WkM4MWNUUmpZekJyUFMwdFVHVkhlamRyZVRCWlJtZGFaVFkxU2xOaE9GcG9kejA5LS00ODRmOWJkOTZhMzc2ZmQ1MmMzZmRhZDNlYjI0NDMyZWFlZDRiMTRk?cid=913804783
    • https://addto.password.land/XYUZJdmFuTXpiVFpFT0RaTWNHNVVPR1lyWmxKWmJGVkxUalpxWlN0VGJHUlpVQ3RZY1V4TmFrVnNkVGgzU0hkMVoyZDBSVlE0ZW1aNE0zZDJNa1Z3UTFkbmVta3pRV053TDBwbFVVVmlWVTFZWmxremIwVXhPVTFFZGxKVU4xZE9kalFyWjB3eFJFOUVSRTFZWW00cllrZE9UbEZ5ZFN0dlUwSm9VelZMZG1WRlNqWjNkbEZ0UkVKdk0wdHBTWGQyUlRJeGFVazRZV1ZxY1VNMFRXZEJZMGg0Y2s5c1JsSTFlSFZuUFMwdE5EWk5ORmhHY0drMGNGaDJTMjlaWW5Cdk5WTk1VVDA5LS1hOTg5YmQzNWRhZjljM2Q2MTYzN2E2N2UxOGViMzE3NzZhYTk3MGZj?cid=913804783
    • 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
2d3fb9dc91ec1720a29b410bb438aec2921dc2a421b5eb44079a1da7f797b390		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 597 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
fdf0ebe9b18421f5c4334ad36bbdcf90cc1c53170e7c465187844e10a65f1466		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103710 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off00019643.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x19643 4575 bytes

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