Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb1f84012428c39…

MALICIOUS

PDF

7.3 KB Created: 2021-10-09 14:10:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 731b65e7e4d0646ba342b331383645c2 SHA-1: f381b5f941b21f77bd2bb5ca7d08375d3064c607 SHA-256: 1fb1f84012428c399ddf34071d4ca25e3c00877dc38db6cff1e944e3d53484ab
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 trick users into clicking a link. The embedded URL, http://yughmelememlxlm.updta78-serv1ce.info, is hosted on a deceptive domain, further indicating malicious intent. The file's structure and the presence of a deceptive link strongly suggest it's part of a phishing attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.1675

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 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://yughmelememlxlm.updta78-serv1ce.info PDF link annotation
    • http://www.microsoft.com/typographyMicrosoftIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193 3248 bytes
SHA-256: 19aa9f32aa5c44a37a5c60bdc84be560e861174a419ba2a7babcd1b9d84166f6

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