Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff916c9cc9d9389a…

MALICIOUS

PDF

8.1 KB Created: 2021-10-03 19:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6a5cc259f6edfc0f9860c7edd453ce4c SHA-1: 8987e06301f8c02d079f52b61cf4cd88d76b2a9d SHA-256: ff916c9cc9d9389aa9670fd9d2ba075ae909c297dae4e9758300a0e98444b531
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as an image-only lure, a common tactic for phishing attacks. It contains a deceptive URL, 'http://wyge.updt644-serv1ce.info', which is likely intended to trick users into visiting a malicious site. The file's small size and image-based content further support its use as a deceptive phishing attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.1666

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 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://wyge.updt644-serv1ce.info PDF link annotation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550 3152 bytes
SHA-256: 8b96cec4871f5d31685e1fb7a1a88081709b982310b4ed56b6382d31cde2c6cf

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