Malicious PDF — malware analysis report

Static analysis result for SHA-256 26976ed29b2aa099…

MALICIOUS

PDF

9.2 KB Created: 2021-10-04 08:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 57460322c5ffd74a62ac66b0de19dbe7 SHA-1: cb2f7b450e4b465eb13d8650f09d2189da699072 SHA-256: 26976ed29b2aa099213d5ed4a6ab3b800fc3a255bb7d5fb2b47ef2f3685a58a0
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing attempts, with a deceptive link embedded. The heuristic 'PDF_IMAGE_LURE_DECEPTIVE_HOST_LINK' specifically flags the external URI 'http://repmermeschlnen.updta78-serv1ce.info' as pointing to a typosquatting domain, strongly suggesting malicious intent. This pattern aligns with spearphishing attachments used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.1671

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://repmermeschlnen.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_off000016d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D0 5436 bytes
SHA-256: 6e04c145d8137ca45f958389d7418cff3d02f1875a7f232ea40062b0a818f971

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