Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ca5d838d387b9f…

MALICIOUS

PDF

51.2 KB Created: 2020-03-11 13:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2026-05-08
MD5: 3d4c3842d33ec15d638579f809ed0337 SHA-1: 33607a4c6a590b75e0a4c03c8b422b656ec274a1 SHA-256: d8ca5d838d387b9f03c9c175d275066ca65c22763b7e4569015311e1b3874036
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to distribute malicious content. The heuristic PDF_SEO_LINK_FARM specifically identifies this pattern, indicating the document is part of a link farm. The embedded URLs point to various PDF files on different domains, suggesting a coordinated effort to distribute content or redirect users. No scripts were extracted from this sample.

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://sbobet.lucky1st.com/uploads/1/3/0/2/130291040/130291040.html#propanol+and+acetic+acid+smell PDF link annotation
    • http://ibwaa.org/uploads/1/3/0/6/130620746/9a0229.pdfIn PDF document text
    • http://stickyearth.net/uploads/1/3/0/2/130289278/nokaxo_talemosika_kadipavekolida.pdfIn PDF document text
    • http://entresift.com/uploads/1/3/0/4/130435706/b389a.pdfIn PDF document text
    • http://dhshighschool.com/uploads/1/3/0/3/130323585/1181050.pdfIn PDF document text
    • http://randimoniumshow.com/uploads/1/3/0/7/130776157/9bd26ca8d.pdfIn PDF document text
    • http://beachdelish.net/uploads/1/3/0/6/130621059/afb946a8c327.pdfIn PDF document text
    • http://resolien.com/uploads/1/3/0/6/130639212/segin.pdfIn PDF document text
    • http://differentlevel91.com/uploads/1/3/0/6/130639764/vokiwexadenuwov.pdfIn PDF document text
    • http://sarinabenn.com/uploads/1/3/0/4/130488969/7725019.pdfIn PDF document text
    • http://bookweej.net/uploads/1/3/0/6/130604402/gumowomubo-polemikaxi-tufudojizera-renomu.pdfIn PDF document text
    • http://scott-enterprises.net/uploads/1/3/0/7/130776769/91e1c6e5d0.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 7

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8206 6496 bytes
SHA-256: 5799fb81e261f6dd50ff9b503e85c44e438542e2bf8c8893756d066a073750d7
font_01_sfnt_off00009201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9201 8948 bytes
SHA-256: 880719deb885bf46ca77e4b104a61984d1a0dfde0486ffe03b431732b4a6860f
font_02_sfnt_off0000b434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB434 3060 bytes
SHA-256: d53fa48170c4352c3126f3a5b1e0a158fa1e8c68f063f74e113d7c3517d88077

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