Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b45dcf08bd0da0f…

MALICIOUS

PDF

54.2 KB Created: 2020-05-30 16:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 2d00f23217e7d3f17ca032613349f3ed SHA-1: 38b6dda641d04b19f7196737dc7ab60a7955b5e1 SHA-256: 7b45dcf08bd0da0fde6cb17605867469ba6fd836bea98d34f3f2b7a7b1fede39
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files on unrelated domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://psychoneirology.org/uploads/1/3/0/5/130551298/130551298.html#vygotsky%2527+s+educational+theory+in+cu PDF link annotation
    • http://ellenandquinn.com/uploads/1/3/0/7/130738727/vezek.pdfIn PDF document text
    • http://jirehconsultinghonduras.com/uploads/1/3/0/7/130738616/8088777.pdfIn PDF document text
    • http://myeducationmatters.org/uploads/1/3/1/4/131453010/xiwimapimiteso.pdfIn PDF document text
    • http://truck-finance-australia.com.au/uploads/1/3/0/7/130776350/8932823.pdfIn PDF document text
    • http://mail.staghornridge.com/uploads/1/3/0/5/130544898/f0c84e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7DB 10640 bytes
SHA-256: ed7ec5e0e85a3a4a3b40d884b00fb9f23188c01b8b51233700c5ac7520eeec7f

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