Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5d5b85d5a2245f…

MALICIOUS

PDF

9.4 KB Created: 2021-10-16 09:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1abc152c4e8d697cfe98e38933d55597 SHA-1: 94292eb02d7cc15044a7b29633459f708c38f208 SHA-256: ef5d5b85d5a2245fa3299d42c32878c66aa335409854e8ad2af236c84c56d340
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is designed as an image-only lure, typical of phishing attempts. It contains a deceptive link that directs users to a potentially malicious domain, likely intended to host a further stage of attack or a phishing page. The heuristics indicate a high likelihood of a deceptive host link being used in this lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.1763

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 9 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://yughscreenlendfllm.updt644-serv1ce.info 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_off0000127b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B 12396 bytes
SHA-256: 9651c78dad64c31681e27aaf77368dfa0aab65a72df78104afb2fc8edab34c59

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