Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa91bbcb15ac5c36…

MALICIOUS

PDF

107.3 KB Created: 2018-06-12 09:41:10 -04:00
MD5: decebade6c1324f2ec27470e5809a210 SHA-1: 4c32b9493cec9f8c1ceba6babe7a1360825bbd60 SHA-256: fa91bbcb15ac5c36493700c1e3a3313bae1dfdf523057e00fd6c58048834827f
160 Risk Score

Malware Insights

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

The PDF document contains JavaScript that triggers a fake Adobe Acrobat update prompt, attempting to lure the user into clicking a link. This link, 'https://su.onamoc.comano.us/XVFZsc1RVdEljWGxzT1ZKWE4wRXpkR0ZpZWxSemRGbDBWSEpOUTBKNmNWRnNUV3RxSzA0emFuWmlUbkF4THpKb2JrOHhjRmN4TjB0VVpubFBNM1JJYW1aV2JXbHpiVXBaVUVkUWNrbFdSMHB2Y1RsdVJYSnNTbTFtV25GcVZXaFFTMDU2YkhVeGJFZ3dURTA5TFMwMVpGRXZUMFZKWlVoME1rUlJZM0ZGVEdkNUsxTlJQVDA9LS00ZTFhMmRhZWY1NTkwYzg4MDYzNDhjZWYzNjkxYmUxMDQ5ODgwYjE0?cid=913938735#FDF', then submits form data to a remote server. This behavior is indicative of a phishing or credential harvesting attempt.

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://su.onamoc.comano.us/XVFZsc1RVdEljWGxzT1ZKWE4wRXpkR0ZpZWxSemRGbDBWSEpOUTBKNmNWRnNUV3RxSzA0emFuWmlUbkF4THpKb2JrOHhjRmN4TjB0VVpubFBNM1JJYW1aV2JXbHpiVXBaVUVkUWNrbFdSMHB2Y1RsdVJYSnNTbTFtV25GcVZXaFFTMDU2YkhVeGJFZ3dURTA5TFMwMVpGRXZUMFZKWlVoME1rUlJZM0ZGVEdkNUsxTlJQVDA9LS00ZTFhMmRhZWY1NTkwYzg4MDYzNDhjZWYzNjkxYmUxMDQ5ODgwYjE0?cid=913938735#FDF
    • https://su.onamoc.comano.us/XTjNZeVRISlRaMWwzTHpCYWFXOVBWalJOTlRkWWMyNXZjbVF2UjJsUUwyNVFhRFoxY2tNd2RsbEdlRkpwYW1ObFJqRmtVRzFvVWpOc1JuVTRaa1p5SzAweE5UQlJWV0YyVDNVck1sSmpUWE55VGt0cllra3diSE5vTjJzMWVVdHVZakJWUm10S1pEUlFPVXRRU3pkMVdHTllWalZVYkRkTGJGTkVMMjFEVVUxbVFWVjRZVzR5WmsxdVUwZEtVRzR6U0VWalJpdHVjMVpQYWtsUE1ucDVSbE5aYVdjM1pFdG5WUzlWUFMwdE1FOHdRek5hYW5ObWExbHdhM1pvUWtJNVZVODRVVDA5LS04Y2FiNmZmNzRkMjVlODliZjI0NjQyMzYxOGMzMWZjYjM0YjdlZDJi?cid=913938735
    • https://su.onamoc.comano.us/XVkhOeGRVcFdSR1ZIYzFObVNFcE1VRXgzVkRSdmFqbFdNVGR3UlRRM1RsUXdWRTltU25GdVpEUnJSWFptUmxOek1GVnVNamt2YlZGVmRYVkJOMDlIVDFaSGVtUjRUWFp4YldWT1ZVTkZSVFJvV0RSWFkyTkRNMUY1ZEROT2VrRnNRa0lyWnpaV01IVjBVelJoZVhVMFRFSXhla1UxWlZKeVpWWkpVVk5uTTNrM1VHaFROMFVyWkRFeFpIQnlhMnhLYWtvdmNtNUpaRXBQUVZSWlRVbHlkbHB3Um5ORWJFWXdjaTlOUFMwdFpGcE5OazExWkc5NksxVXZaamhSTlVaUlMxVlJVVDA5LS00ZDQ5ZWU2YmZmMjJiNjNkOTU1MDExNDk5YjVjY2M2ZDNmMjM0MWNh?cid=913938735
    • https://su.onamoc.comano.us/XY0RoSk16TlBTMFpZTkRGWGVVSjBNa0pPTTIxMk5IQTJVRk5FUjFaSU1FVTNWMnd2UjBaVVNtRk1WMGswUWl0cGN6UnpiRzl5UlZBd2NUUXlXVWMxU2xKaVVIVnVNWFV2Wm1kWVJHSkVkV3QwZGpScFlscDJUV2hEY0RsS1QzQlRiWGhKVUV0WlpIUnNUVVpYVDNwSVFWSndNR3BXUVRaTmMxUTBOWFZJT0RNNVNGUXdNWEl4Um5wS1RuaHhkeko2WVRKUmNHaDVaRVYwVVV0bVMwaHpMM0p3U0U1VU5rbHFNREJ2UFMwdE5uaHdjSGRIVVZWV1VXNTBTbGd6VUN0eWFXMHJRVDA5LS1lZDYxMjI0MWY4NDg3MjQ2MzVhMzg2ZGE3ZGUwYTlkOTZiZGVhYTJl?cid=913938735
    • 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
8d6907bb3cfc98e9746c6d11fa51df89d69479121c34fc8aebb2ae3ab30b9cb7		 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
0fbdd69b0a6c16d98682a50d61ac97950af98f685f8781dc9745506bf51b5c97		 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

Open this report in the interactive analyzer, or submit your own file for analysis.