Malicious PDF — malware analysis report

Static analysis result for SHA-256 f647cba8609235e1…

MALICIOUS

PDF

39.1 KB Created: 2020-04-17 13:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2026-05-09
MD5: d4ec8ba0f34432c2ef474c9d5e9d2ba8 SHA-1: 24c11a901d7bb76eaa771d1245f2608fe879be02 SHA-256: f647cba8609235e1515a9ecd1c402fd6e23908f8601caf7b219f7c79b916275d
136 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: User Execution T1566 Phishing T1566.002 Phishing: Spearphishing Attachment

The PDF document contains a significant number of external links, many of which point to other PDF files hosted on unrelated domains, suggesting a link farm for SEO manipulation. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content likely prompts the user to install a browser extension or update. This is a common social engineering tactic to facilitate credential theft or malware installation. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://claraspilates.net/uploads/1/3/0/5/130540246/130540246.html#natural+reader+android PDF link annotation
    • http://learneventpainting.com/uploads/1/3/1/3/131398139/durimaganese.pdfIn PDF document text
    • http://inner-sessions.com/uploads/1/3/1/4/131453323/gewugamekob_xonisuvavuta_xaxubi_gamefibizomuxu.pdfIn PDF document text
    • http://elliebustamante.com/uploads/1/3/1/4/131437085/zosivalobigemum_runev_gawawigetig_gifekefuw.pdfIn PDF document text
    • http://blackbeltworldatclayton.com/uploads/1/3/1/3/131383931/9878689.pdfIn PDF document text
    • http://dakotaashleymarie.com/uploads/1/3/1/0/131069750/7130680.pdfIn PDF document text
    • https://www.EnsureIn 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 8

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_off00006fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC3 8712 bytes
SHA-256: ab3d988f316adbfb02ae315d7967114c89e2e57ebd648dc1d7e07724b30de56a

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