Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a332fb73136388…

MALICIOUS

PDF

51.7 KB Created: 2020-05-28 02:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae7b43c3d48e9b1a9fdfca06cec358e4 SHA-1: 2d7a1a30155231be08bdfc231888ba69cba01845 SHA-256: 04a332fb731363881ab0d0d62df6ee84e664bb98f7eb478c9c4fa29137c2b99b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to external resources that appear to be part of a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external links suggests an attempt to redirect users to malicious sites or host further malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://barcelosdelivery.com/uploads/1/3/0/6/130604333/130604333.html#cheaper+alternative+to+copic+markers
    • http://hostmaster.violets.nl/uploads/1/3/1/1/131164248/3ee98c.pdf
    • http://carrosdepelicula.com/uploads/1/3/0/6/130622027/1790901.pdf
    • http://blinkbright.org/uploads/1/3/0/5/130551586/9788884.pdf
    • http://proconstructionteam.com/uploads/1/3/0/7/130740443/tekirok_newinulusuxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f28.bin
7f02a22e22b8905ddfc1f45186264489dd95d08153b096f52dbafc2402371b4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F28 10740 bytes

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