Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71636e24760e987…

MALICIOUS

PDF

7.7 KB Created: 2021-08-30 09:06:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 892c10dcf9ec484de6d98ccc914c6959 SHA-1: 3e57d7b1ba717e30d1001dd3b133fee6b974ee68 SHA-256: c71636e24760e9874c86749cae46658ce2dedaecc77d3d641ae17b70bb523662
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as an image-only lure, containing a single image and minimal text, typical of phishing attempts. It includes a deceptive link to 'http://bayian1982.updta78-serv1ce.info', which is flagged as a typosquatting host. This suggests the primary goal is to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.1832

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://bayian1982.updta78-serv1ce.info PDF link annotation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197 4596 bytes
SHA-256: df54468c4542d2809a768a696e6ddb23c82de4f0540a88a4f75b959c05134838

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