Malicious PDF — malware analysis report

Static analysis result for SHA-256 594c68467c22f67e…

MALICIOUS

PDF

75.7 KB Created: 2021-03-20 17:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 41364072372ac01e0534b4f42c9714dc SHA-1: 18c88f81a9ec050b1d9810a7bbdb5f205da049a5 SHA-256: 594c68467c22f67e97d9b06921614ae9678be1445c6df857f09c413ace483fde
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, likely for SEO manipulation or to distribute further malicious content. The presence of external URIs and a link farm heuristic strongly suggests this document is part of a larger malicious infrastructure.

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://kuzutuzo.ru/award?keyword=basic+physics+mcqs+pdf PDF link annotation
    • https://ruxabetuju.weebly.com/uploads/1/3/2/7/132740595/pepirisamakonopowinu.pdfIn PDF document text
    • https://tajifajedu.weebly.com/uploads/1/3/1/6/131637014/xigalu.pdfIn PDF document text
    • http://bejuzoz.iblogger.org/jivibozakajaxikawo.pdfIn PDF document text
    • https://zikotidule.weebly.com/uploads/1/3/4/6/134604350/nosusolebanelik-renax-jimewexiwe.pdfIn PDF document text
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/palowap.pdfIn PDF document text
    • http://duzeliwuk.iblogger.org/65987938727.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/3714392.pdfIn PDF document text
    • http://hallop.xyz/how_to_develop_better_public_speaking_skillsgqf4p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476135/normal_5fc76f4769b03.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/pogevugem-zolukodifo-ripibabo-zakokizanifataw.pdfIn PDF document text
    • http://nuverlites.online/what_holiday_drinks_are_at_dunkin_donuts5rm9q.pdfIn PDF document text
    • https://tuxinotem.weebly.com/uploads/1/3/4/8/134883911/gexufura-gusevefujuzo.pdfIn PDF document text
    • https://rosififobagas.weebly.com/uploads/1/3/1/1/131164218/daxerebokuwipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489850/normal_5fdb7ee41e545.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378152/normal_5ff71ad872e39.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/154464f2a.pdfIn PDF document text
    • http://gegezuwe.iblogger.org/93157956888.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/e8f69080-1b78-43d2-8ba7-43542cf40dee/what_does_equipment_kills_mean_in_cod_4.pdfIn PDF document text
    • http://nibejodawugizex.rf.gd/vujemasuturonixedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d1762b-cb34-4cb0-ba95-c8581b046704/vidutowofepigetadeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e60d040-f2e4-439a-aaaf-83101815be53/71241433712.pdfIn PDF document text
    • http://wekazuvenasiwuf.epizy.com/xijijovo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 5544 bytes
SHA-256: d0977c251d58af2e8bb9f3855e50044a791639caf47b19a58c209441fbe3d046
font_01_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 10700 bytes
SHA-256: 5081486d4675b83dabb087e482eb453e79c84133545fc6109b2880773fa13da4