Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e40937d1eb6029…

MALICIOUS

PDF

36.4 KB Created: 2020-04-08 03:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 4f4c859624ebe35d25e80b3aa7b6f816 SHA-1: 6e252e669f27a4f02ff8ed63ff0a347d5ee7051b SHA-256: 26e40937d1eb6029cb0eb71a24c1c9298e24254705ce5fcb9c1e9ca61810e90a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or distribution network. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content. No scripts were extracted from this sample. The primary attack pattern appears to be SEO manipulation or the distribution of further malicious content via the numerous linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://reliantdiversifiedservices.com/uploads/1/3/0/4/130476413/130476413.html#minuchin+family+systems+theory PDF link annotation
    • http://zafferanomonferrato.net/uploads/1/3/0/6/130621732/ca07f6e.pdfIn PDF document text
    • http://marcsingsmaui.com/uploads/1/3/0/4/130483697/xijipoxevod.pdfIn PDF document text
    • http://nickvandewiel.com/uploads/1/3/0/6/130605016/1761484.pdfIn PDF document text
    • http://whitetrailfarmhouse.com/uploads/1/3/0/4/130489377/gisezijupow_nubinerowagim.pdfIn PDF document text
    • http://cyda2014.com/uploads/1/3/0/5/130541356/tomixovederunipomona.pdfIn PDF document text
    • http://theartofballoons.eu/uploads/1/3/0/8/130813643/bca428.pdfIn 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

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_off00006982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6982 7056 bytes
SHA-256: e316ad7f122147e61faad8123159bc925839660085573766c9f1fff652e29d3f

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