Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e09c3c4cb560763…

MALICIOUS

PDF

7.0 KB Created: 2021-10-03 11:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8918c3f1d7a9f33377205f53f5be1d96 SHA-1: 67030940e84774e276075f40036b4ebba146f6a4 SHA-256: 4e09c3c4cb560763705f4ceb0011ca5fe951e3f4b5d90932a00d66703a48013a
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as an image-only lure, a common tactic for phishing campaigns. It contains a deceptive URL, 'http://xnsclenmelegymncheny6b.updta78-serv1ce.info', which is likely intended to trick the user into visiting a malicious site. The document's small size and image-centric nature further support its use as a deceptive phishing attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.1675

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 7 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://xnsclenmelegymncheny6b.updta78-serv1ce.info PDF link annotation
    • http://www.microsoft.com/typography/ctfontshttp://www.munchfonts.comMicrosoftIn PDF document text
    • http://www.microsoft.com/typography/fonts/default.aspxIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A 5084 bytes
SHA-256: f95d40e2950ea552301c19853b6c40df18764d1bbd6f5fa51849987c321f350a

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