Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbed15065437105b…

MALICIOUS

PDF

107.3 KB Created: 2018-06-12 09:41:10 -04:00
MD5: a903aa0136365258752151b0622a1879 SHA-1: fc84057e7a09c6f05fe8baf0e4e326114d8426c1 SHA-256: bbed15065437105bf2c5424ea40a44753ae9ae9cd43e18df31ab5d5333b7d3d5
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 executes automatically upon opening, displaying a fake Adobe Acrobat updater prompt. This script also attempts to submit form data to the URL 'https://mail.kb4.io/XVm1GaVQzSk1jVkJHVVRKU1VYZEtkVGRZTlVwUWVVWkNiWEZOWTFadlVVaERObXRhVTJWaVMyNHdUeTlOVTBacmMwUllWMkZzT1dSNE1IRk9SbFJJZEVadllVRjJibkY0V0dOS1NUUktLMU5aWlVWbU1XazNSRlIzTW1WalVHRjVhV1l6ZFdRMlVpOVhNakE5TFMwNFNuTnplRUpNU1hsNFVGUlhhaXRtS3pKQmRpdEJQVDA9LS0zZDMyMTcwNDljMzcyNTk0NmNmOGRlNzRjMzczYmVjZjVkNmU5ZWNl?cid=896898080#FDF'. This behavior is indicative of a phishing or social engineering attack, likely intended to trick the user into downloading a malicious payload or revealing sensitive information.

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://mail.kb4.io/XVm1GaVQzSk1jVkJHVVRKU1VYZEtkVGRZTlVwUWVVWkNiWEZOWTFadlVVaERObXRhVTJWaVMyNHdUeTlOVTBacmMwUllWMkZzT1dSNE1IRk9SbFJJZEVadllVRjJibkY0V0dOS1NUUktLMU5aWlVWbU1XazNSRlIzTW1WalVHRjVhV1l6ZFdRMlVpOVhNakE5TFMwNFNuTnplRUpNU1hsNFVGUlhhaXRtS3pKQmRpdEJQVDA9LS0zZDMyMTcwNDljMzcyNTk0NmNmOGRlNzRjMzczYmVjZjVkNmU5ZWNl?cid=896898080#FDF
    • https://mail.kb4.io/XUWpKbmVVNHhiVXRZVkVSRlkwNXFWMVJFSzJwbGJrNXNTV1JoVVZwbUsySk1XbmRyTkhseWRFNXRVVFl6Y21kUmVtOW5iM05ZTDFoclJFVXJOR1Z3ZFhOV1ozUnZOMjFtZG1aTlZFZFJSek5aUWxkcE1UVnhkR1J1VVZkVWJWbFRNRXR3Y2l0SlR6Tk9hRWhtYWpOeVlqSmpRWGRPVVROQlkzSmtkWHB5Y1VseFZEQjJaazl1YkdGV1pIVlJWM2xNUkU5M09ITlVkbEZ4ZUd0dmRXTnJhelV3Vm0xRk5tOHdSREJCUFMwdFQwNWhUa3Q0YjBWSWRHWlZaRGhPY2psRldrNUNVVDA5LS0yZDcxMmU1MTkwN2MwMmIwNTEzZTBjNzRhZTA2OGZjNTQ2NDJiZGMx?cid=896898080
    • https://mail.kb4.io/XUlhOSlFtODBTVk5tWlVVd05rZ3pXSFpzYW1VdlExTlpVVTFhVEdwd1pGQmpRVFZLVUVsdmIxVlpURWxST1hCWlFVSlpkekphTVc1VGVEaDBlblJ3TUdoV1YzbGpibGN2ZWt4c05sVllOMEptWW1aUVVUZHFXVXhSYUZnNFZtOHJOelptYzBsT0wzTnpUWFJaY1Vrd2NpOUlTbU5ZTTNOWE1GQlJhV1oxZVUxbGFFMUNNa052YTI1MFZsazNlamREVG1WcE5IY3dhVkE0TDJkelVWZFNRM2gwWlVsTVEzUm5lVEp2UFMwdGQxQjJXVlpoZFhrd1pqWmpXazFPZFdSUFVreE1RVDA5LS0xNzdkYTYyMzY4OTUwYThjNGEzYzBlMDc5OTUxMzMzYzQyMDFmMjY3?cid=896898080
    • https://mail.kb4.io/XWTBwU0swZDRabEZ5UTFoUEsxSlRVWEpIYmtFMU9UbEVTMnB0VWswck4zcExjMnRtU1ZoaWJFMVNabWxoV1VKcGJrZEtjVEo0U0VGU1R6RklOa0ZwTUdwRVZsZzNibTFwYkZGeVZWRXpXWGhZWkdOQmVHUTBiR28yYVVnNFpWTnpZV1pXVERKVU1XWklaVWd4VVVJelJVcDZWSEExYzFodVIyUXZLMDlVYnpWVkt6aGxhVUZUYjJWdFlWVlNRMUJQUTNodFNUbFdhVWN2VjBObFJFdGpPV3BVZGpWb01ERjBRWHBOUFMwdFIwa3ZNbFIwYWxkc1ZIUnNXRTFKUVUxc2VGaFpkejA5LS01MmMxNDdmMzUxN2Q0NTUwNjkyMjFlMTkzY2I3MTAyYjU5OTZiOWEw?cid=896898080
    • 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
2deaa562db001422336958358b446f20069d60e0de43a3c10f1a13dc16bd644d		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 589 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
d2741b4957c891740b89cd2ea505a70a1454837d1749e500e38da6b3c0cf603a		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103678 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off00019623.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x19623 4575 bytes

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