Malicious PDF — malware analysis report

Static analysis result for SHA-256 459837f28ebd3bba…

MALICIOUS

PDF

56.3 KB Created: 2021-10-21 01:01:54 +00:00 Authoring application: Chromium (via Skia/PDF m94) First seen: 2022-03-03
MD5: 25ba40f56602738aa8414a48ae3fbcd3 SHA-1: c9ac4ef3b95bfd9d9fd88b655592ebdfcddf19ce SHA-256: 459837f28ebd3bba1bb04e74ba006dc07d72b58d10d86be2362f5e082a739906
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as an image-only lure, typical of phishing attacks. It contains repeated, invisible links pointing to a RAR archive hosted on 'absolutepo.com'. The ML classifier strongly indicates maliciousness, and the structure suggests evasion techniques were employed.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9489

Heuristics 4

  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • 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 56 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://absolutepo.com//wp-includes/ID3//Urgent%20Order.pdf.rar