Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b58eb2974b15400…

MALICIOUS

PDF

10.3 KB Created: 2021-10-16 09:32:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3d634656ebca857275b9317a799f8a44 SHA-1: b9e7d82a6cdaa9708cf1fa76177e349abc49defa SHA-256: 5b58eb2974b15400ea37d7c14b69a7dbb0f44269cd0a9d3b2d60b29c6b37a2c2
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is an image-only document designed as a lure, typical of phishing attacks. It contains a clickable link to a suspicious, algorithmically generated URL, which is likely intended to lead the user to a malicious site. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0168

Heuristics 4

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 10 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://yughrwdelfelexenderschreedersmlfmwng.premmise.ru PDF link annotation
    • 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_off0000161e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E 12396 bytes
SHA-256: 9651c78dad64c31681e27aaf77368dfa0aab65a72df78104afb2fc8edab34c59

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