Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7fb5a301ddbdf3…

MALICIOUS

PDF

8.4 KB Created: 2021-10-23 16:36:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a86cb32b536bd7962f1cfe6df8ca0ca9 SHA-1: f511563561d4449d5f8b6c65bc03d6a1b34d0da6 SHA-256: 4b7fb5a301ddbdf38a5a534f42fedf0c5bad6cfbefc431a13b71d2e4b56ea53c
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as an image-only lure, typical of phishing attacks. It contains a deceptive URL, 'http://moierversperwesselmrhelnlend.updta78-serv1ce.info', which is likely intended to lead the user to a malicious site. The file's small size and image-centric nature further support its use as a deceptive phishing attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.1778

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 8 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://moierversperwesselmrhelnlend.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_off0000161d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D 3304 bytes
SHA-256: 20674fb25dd6bcb17ea82cbaddcc7869e50b2e071a7f523a75f2530b528e4027

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