Malicious PDF — malware analysis report

Static analysis result for SHA-256 66181bd6d68e0ce2…

MALICIOUS

PDF

12.3 KB Created: 2021-10-10 08:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 187c7a97a89591c4c669b4c1b98bad7a SHA-1: 4709948d70e81481c945f324b340cdc72c14fff8 SHA-256: 66181bd6d68e0ce250cde1719633a49dbf445babe27e1eed498e628fc23ed00a
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing attacks, which contains a deceptive button that redirects to the malicious URL http://yughbellesbeewmypwnnem.updta78-serv1ce.info. The document body contains text in Russian, 'осталось чучуть нажать только кнопку', which translates to 'just a little bit left to click the button', further reinforcing the deceptive nature of the lure. The embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.1467

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 12 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://yughbellesbeewmypwnnem.updta78-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_off00001728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1728 14528 bytes
SHA-256: 8a06f102030db8a77d3e654bdd5875aa16f996be691ed97af9f5e6479375eaa0

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