Malicious PDF — malware analysis report

Static analysis result for SHA-256 81300be9708b3db3…

MALICIOUS

PDF

36.0 KB Created: 2020-03-12 03:39:33 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2026-05-09
MD5: d8cf9490b4641c5bbc7d9ab8ccebfceb SHA-1: 340443c8414a9d74692e98af053e2cd16d326a22 SHA-256: 81300be9708b3db3d9e57cd2b274b2ee792cca5d06bd6b3e64772711f1d23e17
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam campaign. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external links points towards a malicious intent to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://codegaffer.com/uploads/1/3/0/5/130551211/130551211.html#the+absolutely+true+diary+of+a+part-time+indian+study+guide+pdf PDF link annotation
    • http://myremio.com/uploads/1/3/0/7/130738740/xajexituwexis-binolewaj-miwiratuponopiv-rujixakovebi.pdfIn PDF document text
    • http://lifeindustries.org/uploads/1/3/0/7/130776049/ce957e.pdfIn PDF document text
    • http://lakarnevalistas.com/uploads/1/3/0/7/130740550/99aa206.pdfIn PDF document text
    • http://cdroadservice.com/uploads/1/3/0/8/130874304/zodegolipif.pdfIn PDF document text
    • http://habitatmodern.net/uploads/1/3/0/5/130551562/momun-lexusegijexaf.pdfIn PDF document text
    • http://www.mkequipements.ca/uploads/1/3/0/7/130776122/cc0958d47b148.pdfIn PDF document text
    • http://www.savejacksmountain.org/uploads/1/3/0/9/130969645/8808511.pdfIn PDF document text
    • http://blackwallcompany.com/uploads/1/3/0/7/130776141/04d08f3354.pdfIn PDF document text
    • http://darkskyislands.net/uploads/1/3/0/6/130621511/mexutotabogid.pdfIn PDF document text
    • http://cagedchicken.com/uploads/1/3/0/2/130289741/18e222e52a49f.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_off00006557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6557 7452 bytes
SHA-256: 73fbe09e5fb776aba739eadac9c564e800f0e9e76dd3952af1b2fcd9703c25f1

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