Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d77553c204754b…

MALICIOUS

PDF

8.1 KB Created: 2021-10-16 09:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: dcfece71d588005bfe72fef16185c09a SHA-1: ccd90d33f1219da69ef752740a12d32ab9d32c19 SHA-256: 23d77553c204754b622b2107da6ff5255cb9a435c6272942740c3e61e8d742f4
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The PDF is identified as an image-only lure, a common phishing tactic to trick users into clicking on deceptive links. The embedded URL, http://yughwesmenfwssbell.updta78-serv1ce.info, is flagged as linking to a deceptive host, strongly suggesting it leads to a malicious site. The heuristics indicate this is likely a spearphishing attachment intended to lead the user to a compromised resource.

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 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://yughwesmenfwssbell.updta78-serv1ce.info PDF link annotation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000155e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E 3152 bytes
SHA-256: 8b96cec4871f5d31685e1fb7a1a88081709b982310b4ed56b6382d31cde2c6cf

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