Malicious PDF — malware analysis report

Static analysis result for SHA-256 951c4888a389045f…

MALICIOUS

PDF

39.8 KB Created: 2020-06-07 02:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 70b7da5fd3bd1552c5134c60f34ac1b1 SHA-1: 0e762c0e43340de901c0ec23458b400b6dd78ec4 SHA-256: 951c4888a389045f71ceb7073b0b328cf3b669b9c9662ffe7bad1cbb61215997
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO manipulation tactic. The document body contains garbled text and references to 'wkhtmltopdf', indicating it was likely generated programmatically. The primary intent appears to be directing users to a large collection of external URLs, potentially for malicious redirection or to inflate search engine rankings.

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://mail.francelaude.com/uploads/1/3/0/5/130588502/130588502.html#derecho+civil.+introducci%25C3%25B3n+y+person PDF link annotation
    • http://thebackupform.com/uploads/1/3/0/9/130969060/807f6486263d47.pdfIn PDF document text
    • http://1r5.undesirable.us/uploads/1/3/1/3/131381376/2524811.pdfIn PDF document text
    • http://turabeachfamilydaycare.com/uploads/1/3/0/8/130874570/gobuvopoj_gexujeziri.pdfIn PDF document text
    • http://ns1.clarkschool.net/uploads/1/3/1/3/131398334/8616517.pdfIn PDF document text
    • http://destinationstravelsolution.voyagerwebsites.com/uploads/1/3/1/4/131438419/39aca040ad3.pdfIn PDF document text
    • http://estebanshat.com/uploads/1/3/0/6/130604446/jigebukuj_gizodotakam.pdfIn PDF document text
    • http://dynamicsoundbarrier.com/uploads/1/3/0/7/130775201/2985996.pdfIn PDF document text
    • http://valleyrage.com/uploads/1/3/0/5/130546923/3135236.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gosijanasi.files.wordpress.com/2020/06/puzivi.pdfIn PDF document text
    • https://zonekavaxed.files.wordpress.com/2020/06/fodejebifigegoj.pdfIn PDF document text
    • https://jutaburo.files.wordpress.com/2020/06/1744712095.pdfIn PDF document text
    • https://divasojawi.files.wordpress.com/2020/06/niveb.pdfIn PDF document text
    • https://fowomavopil899143489.files.wordpress.com/2020/06/61250967835.pdfIn PDF document text
    • https://gizedaresudi.files.wordpress.com/2020/06/xulefikanafase.pdfIn PDF document text
    • https://rovevimupolu.files.wordpress.com/2020/06/78143799216.pdfIn PDF document text
    • https://rafixabon.files.wordpress.com/2020/06/25563808408.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 3

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_off0000690b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x690B 12296 bytes
SHA-256: df53df21674cebafa7d22dd7871df8a8b4b6668c08ecfad3f521a0b32a7bd37d

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