Malicious PDF — malware analysis report

Static analysis result for SHA-256 224af76a1eba82df…

MALICIOUS

PDF

22.1 KB Created: 2021-06-05 09:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0f70789fb93f94606a66850a2511e681 SHA-1: 1df1ee23c8edaa7f07d8df543defcd0423d7175e SHA-256: 224af76a1eba82dfa4365012e54b055a217a1539939e2dd7c3bcfd2eb4714d05
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a malicious lure, including being image-only and using a URL shortener. The heuristic PDF_IMAGE_LURE_SHORTENER_LINK specifically identifies the embedded URL https://nois.page.link/BVhN, which is a strong indicator of malicious intent, likely to redirect the user to a phishing site or download a payload. The malformed stream length also suggests an attempt to hide malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1241

Heuristics 4

  • Image-only PDF lure links through URL shortener high PDF_IMAGE_LURE_SHORTENER_LINK
    PDF is image-heavy with little real text and its clickable action points to a URL shortener. This is a high-confidence credential-phishing carrier shape: the visible page is a screenshot-like prompt while the destination is hidden behind redirect infrastructure.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 22 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nois.page.link/BVhN In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4511 12396 bytes
SHA-256: 9651c78dad64c31681e27aaf77368dfa0aab65a72df78104afb2fc8edab34c59

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