Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd815ce5029b1930…

MALICIOUS

PDF

8.4 KB Created: 2021-10-09 14:34:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1010e36bdbbbf1208e0ad504fe182904 SHA-1: 741d71254febc1871c278b3dbdd4491867992ce2 SHA-256: bd815ce5029b1930639951aff0756b8dc9b91cd10049647e8cefef7ba6c12661
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as an image-only document designed as a lure, typical of phishing attacks. It contains a clickable link to a suspicious, algorithmically generated URL. This URL is likely intended to host a malicious payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier clean score 0.1666

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 8 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://www.microsoft.com/typography/ctfontshttp://www.fonts.comMicrosoftIn PDF document text
    • http://www.microsoft.com/typography/fonts/default.aspxIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199 6180 bytes
SHA-256: 56a52b815ab1d3320d2b86f77abd9fd9ddb7ef0bf6f0425b132bd10f1381ab15

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