Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f91dae9f43da8b…

MALICIOUS

PDF

107.3 KB Created: 2018-06-12 09:41:10 -04:00
MD5: c875a01b071a71c491fadbc3866522ba SHA-1: ab5e650f0109696cbfe150f97f3024b8c1a12c17 SHA-256: e9f91dae9f43da8b9a99ec81305ca7249cd804d26dd2876b1dc6f1c6891caad2
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 triggers a fake Adobe Acrobat update prompt to deceive the user. It then attempts to submit form data to a remote URL, which is a common technique for downloading and executing further malicious content. 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://breakingnews.comano.us/XZEUwd2N6RkJNbWhDVTNsSVVuWllXaXRwTURaYU9XOXpLMlV6Y21oblJXY3hTWEpxUzNGR2NITklMM1JyVjFSbVZIZGpjeTlEVlZOSWRtY3ZkalJ1WkZkRWVYTlFNekJsVEVkRGRGazJkRFk1WTNSckx6WmpTbU42VDB0RlpIbHRkMmQwTnk5MWRUbGpUMFU5TFMxc1VsWmxRM0pYVVhWRGNraGljREUyVkdWcldHZEJQVDA9LS03Zjk4N2EyN2M2YzBkNTYzMzA5ODZkNDBkZTI2NWFjMDY3ZTdjNmZm?cid=904908923#FDF
    • https://breakingnews.comano.us/XTlhWeWRGVnRkbmhZUlhCTGVUZEVZamx3TVVabVlrOHdSSEY0U2taS1MzZ3dTRkJoVXpkMFpuRnhUazkzU1cxNFpXVkNkM2cxTldSMmNHTmphMUpHWkdWbWFVWmpZek16WWpWS1JuRXJhVkpSUTNwWFJrZE5VSElyUWpGbE0zUkhjM1Z4ZVdkT1FqbHFPRWxNV2toSGNUSjJWamgwS3pFM2EydFVZV1ppYms1NFJIbFhOVWhHUkdOSlV5dHRSMjVIWnpFM2JYWjZVR1phUkM5eGRWQjVNaTlKWjBFNFJEUkhLM0J6UFMwdGVIaHJRV3BPWmtSVVVYRjRkVkJEU2pCeU0xSk1kejA5LS1jZTI4M2RlNzIxYzE1ZTE4MWY3NTQzNDk3NWY2NzUzMWZhYjVjMGFi?cid=904908923
    • https://breakingnews.comano.us/XYlZWSGRUVlJRamd4ZDFWSlZDdHlXV04yV0ZsUk9EWTVNRWRRYm5sa05WbGFSamx3VTAweFdTOWlSVXRNYTBsWWVsZGtaVkZ4T1hCa1FXMTNWMmdyVGt0V2QyOTNlaXN6WmpjME5qSlBZV3d3THpJMGJIZEhOVUZzWVVadUx6WjVUMngzVTI5UE9WcHFVRTVHT1VKcmFsUkVlVVUwVGxGNFUycDRNRVozTldGd01UaFhiRVIxTjJoM1JrTnRUR2cxUmtKdVNXTjVhbEZIVXpaMkwxTndZelpYUkhkaFFsRTBiMVJWUFMwdFlWQkJlazQ1Vm5oSFdFOTVabk55VkhSaU5XVmtaejA5LS03M2I4YzFhOTRhMDU2NDFlYzUwMDY2ZTk4OGJmMTU1OTU1NmZjNTdm?cid=904908923
    • https://breakingnews.comano.us/XZGxaMlowRXJiMFExWVVZMk9UbGhMMk52T1V0MWNFNUdObHBJTmxnek9FbG5jbE5QWjNNdlpEaFBRakJ1ZWxsVlFVNHJhRkpLT0RWNFJYcHRlbGhVVERkeE4wUnZLMkYzVDJ3eFNVbE5OV1U1YzJzMmMzSXdiRkJETTJwaldUVk9XbkZLVWk5VE9YWmhiVEZYSzBablQwTlRVMmRKUTJwVFlreGpSSEJKVFZoV05teEtWVVZxZVhjeUswNXdNRkZFVXpoS1FrbHFTSGxNVDJWUk1YUjNLM3BoY2xWTE4wODVla2wzUFMwdFQyeE1RbWwyWkhjMFNqUnBNVlZOYkZOaFMwSmFaejA5LS04YzAyOTdjMjM4M2IxZWNiNWYwNzVlMWJmNjQ3Y2QyZTYwOTdmNzYx?cid=904908923
    • 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
ab7aad39e693b192f4662e57068152bb675291d1fad2ca06d87203be9cab9926		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 600 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
0ff8def7c6a78488244cc7cca0879f506b00c516ad1210975c638134765c43b7		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103722 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off0001964f.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x1964F 4575 bytes

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