Malicious PDF — malware analysis report

Static analysis result for SHA-256 b818dcf1ac949cb5…

MALICIOUS

PDF

79.5 KB Created: 2021-03-20 21:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 75160b52ffdfd6799de344f8a012b90e SHA-1: b8b99d8721db440cd991b9a4b7a8d2c7e2e8382b SHA-256: b818dcf1ac949cb5613793a4e2aaa14f87a3974291dd6eef03fb785916412611
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it, many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://nipisod.ru/strik?utm_term=can+a+person+with+type+2+diabetes+go+on+a+keto+diet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5ff9edb2a4451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419832/normal_6033a2636d217.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/16528547591.pdfIn PDF document text
    • http://nulivanofika.mygamesonline.org/59116368583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_6019d5df012ed.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/florida_keys_inshore_fishing_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407729/normal_60545a61cfb3d.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/bahrain_international_airport_arrivals_information.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/38871833716.pdfIn PDF document text
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/ropidusosireka.pdfIn PDF document text
    • http://jaxifas.getenjoyment.net/62225481997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427313/normal_5ffc664b4981f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_5fe7f0665732d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490369/normal_6016229634af6.pdfIn PDF document text
    • https://tofukoluto.weebly.com/uploads/1/3/0/7/130775982/giwadamovimejibugod.pdfIn PDF document text
    • https://vuwakoge.weebly.com/uploads/1/3/4/3/134368269/5401092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_602e3763f08d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494435/normal_600befe63faa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_601bb667921be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/817c5ed1-d663-41c9-9160-8accfa313fd4/johnson_controls_a419_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08b6627-82b6-4f17-9fa2-0b8c608fb8ce/ejemplo_de_introduccion_con_normas_apa.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 5624 bytes
SHA-256: 6f5ab9ee6a30bbda7a8470475f4a46d8cba089740b4b2efcc2ead5feb01ffb47
font_01_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 1680 bytes
SHA-256: debaf3ff37cadd88e03f56a1da1b20b0676acbb0c2dfc7de7569b922f44b7b54
font_02_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 11032 bytes
SHA-256: 99076e05cb0f20c49e8b8ec2e4865d14a57c0cd214a14eab278c94ff75969c44