Malicious PDF — malware analysis report

Static analysis result for SHA-256 998c88fb555eae93…

MALICIOUS

PDF

57.6 KB Created: 2021-07-05 12:36:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3acf5e47e81bac51fd5c3732f1e1abcf SHA-1: 8a6715463103c0b98e8bb4711d4cb3d3f90471e4 SHA-256: 998c88fb555eae93f3938b6085a20178b7dc6e80b232ee4c0f7c40e7ce3c8d43
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file utilizes an image-only lure, a common tactic in phishing campaigns to disguise malicious links. The heuristic 'PDF_IMAGE_LURE_DECEPTIVE_HOST_LINK' specifically flags the embedded URL 'http://avia.upd657-serv1ce.info' as a deceptive host, indicating a high likelihood of a phishing or malware distribution attempt. The file's structure and the presence of this suspicious URL strongly suggest an intent to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0109

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 57 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://avia.upd657-serv1ce.info PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD40 14228 bytes
SHA-256: 38c1bbc700aea725ea0cf2b120fb9811c5679aa98dc11476935286907f66a403

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