Malicious PDF — malware analysis report

Static analysis result for SHA-256 0723bfa785c85ab1…

MALICIOUS

PDF

6.8 KB Created: 2021-10-09 14:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 16a6bab7abc7f50c3cffc0a5915e94ed SHA-1: 13eb59851da573b5be2cb5722af66d2baff4ec41 SHA-256: 0723bfa785c85ab19bece7c524bbe74b5bba9afae20dfd8a2fb3d237c9b16e4a
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as an image-only lure, containing minimal text and a full-page screenshot designed to hide a clickable button. This button directs the user to a deceptive host, 'yughsgellmenn.updt644-serv1ce.info', which is a strong indicator of a phishing attack. No scripts were extracted, but the structure and embedded URI strongly suggest a social engineering tactic to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4980

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 2 image(s), only 0 text block(s), carries a click-outward action, and is only 6 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://yughsgellmenn.updt644-serv1ce.info PDF link annotation
    • http://www.microsoft.com/typography/ctfontshttp://www.tiro.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_off00000f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12 3604 bytes
SHA-256: ebb53b2dbe8a38eb1b286941e04f09ed70f9cf5171cc5dd23441674110befbfb

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