Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6dff9b48f9cc08…

MALICIOUS

PDF

37.4 KB
MD5: c7021dc3258992bb701dc6ac9a826e48 SHA-1: 6316c03104cc65bb9294369936b108fea57a1313 SHA-256: ef6dff9b48f9cc08ab6325b728e40f0444a9d1650d228a770105d601cc66c253
248 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF document contains an embedded JavaScript stream that utilizes a PowerShell download cradle. This cradle, specifically referencing '[Net.ServicePointManager]::SecurityProtocol', is designed to download and execute a second-stage payload from the external URI 'https://bookinq.netlify.app/#invoice-1619232149.pdf'. The document's structure and the presence of a click-outward action suggest it's a phishing lure, likely presenting a screenshot to trick the user into interacting with the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 9

  • PowerShell download cradle in PDF action body critical PDF_PS_DOWNLOAD_CRADLE
    PDF contains a PowerShell download-and-execute cradle (IEX/Invoke-Expression of a remote payload, [Net.WebClient]/[Net.ServicePointManager], or `-ep Bypass -enc <base64>`). These strings are rare in benign PDFs and are strong evidence of payload staging in an attack chain (MITRE T1059.001 + T1105).
  • Shell.Application.ShellExecute COM pivot critical PDF_SHELL_APPLICATION_PIVOT
    PDF contains a Shell.Application object instantiation followed by a ShellExecute call — an evasion technique that can spawn the next-stage process via COM rather than the PDF /Launch action, sidestepping the reader's /Launch confirmation prompt. Often paired with mshta and a `javascript:` URL.
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 37 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Suspicious extracted artifact medium 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.
  • 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. (matched inside decoded stream)
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.dynaforms.com
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000091b1.js
e36bf3c920283ff8c0a2b94f410f131668a1025664bd0fd52894ca0f33c3f8f5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x91B1 1209 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 shell/COM execution token(s).

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