Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a79bb04b1cc98d9…

MALICIOUS

PDF

22.1 KB Created: 2021-05-28 10:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 4472dfeef2324ac12d7df16a6c620b52 SHA-1: f1790e66e092685686fcf3155b770b7a68c1ba2d SHA-256: 5a79bb04b1cc98d93241b17aede9fdb0d63f071bfb91a5d5fc30f51510cf79fb
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is an image-only lure, typical of phishing or malware delivery, containing a clickable element that redirects to the URL shortener 'https://mrizi.page.link/oULs'. The document body contains Russian text that appears to be a lure, stating 'THREE ATTEMPTS ARE WAITING FOR YOU UPON CLICKING THE PICTURE WHICH WE ARE GIVING YOU'. This suggests the user is being tricked into clicking the image for a supposed reward, which then leads to the malicious URL.

Machine Learning

  • Nyx PDF Classifier clean score 0.1241

Heuristics 3

  • 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.
  • 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://mrizi.page.link/oULs 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_off00003b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B14 15632 bytes
SHA-256: 0b922d707b3b22ead759d8f0340e3dc19871c327e2f05237b18db180a24239fe

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