Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c68faf2535ce14c…

MALICIOUS

PDF

6.4 KB Created: 2021-10-16 09:30:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: acc66ce010530cd29c4ad9761f6b0104 SHA-1: 3957c78fa82094a97d11c54c851b89662346f196 SHA-256: 1c68faf2535ce14c52457a1283dd9698d3cbb47985513ea3d3208c8d9deeb91f
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as an image-only lure, typical of phishing attacks, with a high-confidence heuristic indicating a deceptive host link. The embedded URL, http://yughfrlsewrelymp.updta78-serv1ce.info, is likely intended to redirect the user to a malicious site for further exploitation. The file's structure and the presence of a deceptive URL strongly suggest a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier clean score 0.1502

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 6 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://yughfrlsewrelymp.updta78-serv1ce.info PDF link annotation
    • http://www.microsoft.comhttp://www.microsoft.com/typography/MicrosoftIn PDF document text
    • http://www.microsoft.com/typography/fonts/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E 4484 bytes
SHA-256: bac25f8c219132829148023ce35b0029fa173b7eb2982c35f652ca5ea3ef876d

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