Malicious PDF — malware analysis report

Static analysis result for SHA-256 075b971a6c78cc1a…

MALICIOUS

PDF

106.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: d9be127e83c379cbcb52ce44f2afec3f SHA-1: 378b9516da2a77eddcec7f152b2101e5f41d7cee SHA-256: 075b971a6c78cc1a771ceaafbd06ccfaa8f6fbbf5b3e832f16b74a107c0f422a
160 Risk Score

Malware Insights

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

The PDF contains JavaScript that automatically executes upon opening, displaying a fake Adobe Acrobat updater prompt. This script then attempts to submit a form to 'http://secure.payment-gateway.microransom.us/XcmVEjaXBpZWF50X2lkPTMQzMDE4rSNDQ4SOCZjYW1wWYWplnbl9ydW5faWQ9MTgzzOTM2NSZhY3Rpb249YXR0YWNobWVudA==#FDF', likely to download a second-stage payload or phish for credentials. The ML classifier 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 http://secure.payment-gateway.microransom.us/XcmVEjaXBpZWF50X2lkPTMQzMDE4rSNDQ4SOCZjYW1wWYWplnbl9ydW5faWQ9MTgzzOTM2NSZhY3Rpb249YXR0YWNobWVudA==#FDF
    • http://secure.payment-gateway.microransom.us/XcmVajaXBpZWR50X2lkPTVQzMDE4oCNDQ4VOCZjYW1wfYWUlnbl9ydW5faWQ9MTgzeOTM2NSZhY3Rpb249Y2xpY2smdXJsPWh0dHBzOi8vc2VjdXJlZC1sb2dpbi5uZXQvcGFnZXMvNWI2ZTJkODc5NjFi
    • 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
f99d8cb84e946850b032779a44227ea317ada3bc4d6bbc6b3a1f5e609e1600b8		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 401 bytes
javascript_obj0012_001.js
432bd05fab74142e31bbced1bd25cf7d7449af1cec51faff8331598ff0db8c0a		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 102758 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 7 long base64-like blob(s).
font_00_cff_off0001928b.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x1928B 4575 bytes

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