Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cdc7c5a8dd294a…

MALICIOUS

PDF

8.3 KB Created: 2021-10-10 08:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 172e3297048aa699e7340317b22672c1 SHA-1: 166f63ce554833d9f6abbe7cc211249764d1860d SHA-256: 19cdc7c5a8dd294a353bcb8094e39e76e400293c510e280991ad914d717c3bb6
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as a lure, containing a screenshot and a deceptive link to 'http://yughspdmelnmewnws.updta78-serv1ce.info'. This URL is likely intended to host malicious content or facilitate a phishing attack. The file's structure and the presence of a deceptive link strongly suggest an attempt to trick the user into interacting with a malicious resource.

Machine Learning

  • Nyx PDF Classifier clean score 0.1778

Heuristics 4

  • Image-only PDF lure links to a deceptive (typosquat) host high PDF_IMAGE_LURE_DECEPTIVE_HOST_LINK
    PDF is image-heavy with little real text and its clickable action targets a host that impersonates a security/service/brand word with a look-alike homoglyph substitution — a digit OR a confusable letter (e.g. 'serv1ce', 'servlce', 'upd4te', 'm1cr0s0ft') — on a domain that is not a known-good site. This is a credential-phishing / fake-update carrier shape: a screenshot-like page funnels the victim to a deceptive look-alike destination.
  • 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://yughspdmelnmewnws.updta78-serv1ce.info PDF link annotation
    • http://www.microsoft.com/typography/fonts/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000015e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E9 3232 bytes
SHA-256: e8e642ce397ed383e3fceba8654601d8839484b5c154d694af2ebdf0bb44a27a

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