Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cadb7fbcd3b67f0…

MALICIOUS

PDF

9.8 KB Created: 2021-10-03 20:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 19f398ff5291a1bfa4b38dd59d14d6ba SHA-1: fd7678fb8eb6dc0509f252758e298828015351e0 SHA-256: 5cadb7fbcd3b67f0abb94c609d837b1d6ab0ec8b804a9e11b8cd041ed272751a
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as an image-only lure, typical for phishing attempts, designed to obscure a clickable action. It contains a single embedded URL, http://wsedemerllmeremwrmege.updta78-serv1ce.info, which is also flagged as being on a deceptive host. This suggests the document's primary purpose is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.2047

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 leetspeak digit substitution (e.g. 'serv1ce', 'upd4te', 'm1crosoft') 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://wsedemerllmeremwrmege.updta78-serv1ce.info PDF link annotation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000015f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F3 6868 bytes
SHA-256: 31df58e571e4a4ccfca8baf1c7f292bea96d86507b7daf48a1c77a028a71bd4e

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