Malicious PDF — malware analysis report

Static analysis result for SHA-256 9622850a8e518396…

MALICIOUS

PDF

6.7 KB Created: 2021-10-10 08:28:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 740fa6bb4dfbfac9face57eb5fbbd47a SHA-1: 1cd9c26752e4ee9bf59bb5a47c5e1ce46d22ec15 SHA-256: 9622850a8e518396cf037f4237caa724d935b62c89f0607347ac8e2a80bd28c1
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 campaigns. It contains a deceptive link pointing to 'yughwegnerfemeerm.updta78-serv1ce.info', which is likely a typosquatted domain intended to trick users. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4980

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 2 image(s), only 0 text block(s), carries a click-outward action, and is only 6 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://yughwegnerfemeerm.updta78-serv1ce.info PDF link annotation
    • http://www.microsoft.com/typographyMicrosoftIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17 3248 bytes
SHA-256: 19aa9f32aa5c44a37a5c60bdc84be560e861174a419ba2a7babcd1b9d84166f6

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