Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41f1d3e6cc1ba2f…

MALICIOUS

PDF

9.1 KB Created: 2021-10-09 14:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1311e04746e1c6e2ed223c756781b09a SHA-1: b988909e07661432e75ca0c2d573fae5b303c984 SHA-256: e41f1d3e6cc1ba2f688bd2cbbc6a923387c9f9adf4ae91c6aa3e274b2490c274
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as a malicious image-only lure, typical of phishing attacks. It contains a deceptive link to 'yughcendeservlce.premmise.ru', which is a typosquatted domain designed to trick users. The document body contains Russian text suggesting a call to action, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.1618

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://yughcendeservlce.premmise.ru PDF link annotation
    • http://www.microsoft.com/typographyMicrosoftIn PDF document text
    • 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_off000011c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9 5544 bytes
SHA-256: 6b127a9a3e01e279fdf14532fd700a1859009db91d4ec2caa461c4cd4fcd8982

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