Malicious PDF — malware analysis report

Static analysis result for SHA-256 e212d625d24bbc78…

MALICIOUS

PDF

85.1 KB Created: 2021-03-10 20:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2b009d2f9152b7f3e4f5dc12b0de8640 SHA-1: 490caea31f437f4cf16f8c59e00a5efcc078a47c SHA-256: e212d625d24bbc784c6d1d82269a1a9bfd27df95596209c5690cee71e9f59c1b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or SEO spam. While no scripts were directly extracted, the nature of the link farm suggests it could be used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/award?keyword=almagest+english+pdf PDF link annotation
    • https://mizojomi.weebly.com/uploads/1/3/0/9/130969452/vokanum.pdfIn PDF document text
    • http://xafukuxovikovu.22web.org/68190894832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485573/normal_5fe755c5d0c4b.pdfIn PDF document text
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/9466601.pdfIn PDF document text
    • http://rojorose.iblogger.org/google_sheets_checkbox_not_working.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5ff9eef3107a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501656/normal_6038d531bfe58.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/ddee8de5-41f1-4321-8f16-6c441ac2c07a/29817922128.pdfIn PDF document text
    • http://weverikovufom.rf.gd/engineering_company_logo_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3156c28b-e769-4bba-bd97-eaa699e25a31/i_was_sitting_at_the_counter.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/cabal_online_apk.pdfIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_6a0757a04137445d97ab4dad70a641d3.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_8c2623d312824a77a63d03c6c91c5923.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_d539545f30064aa09424dea9379ce4d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/fbla_parliamentary_procedure_study_guide.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_ff95051db0694618bc6f007f8f7d151b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazofi/jagelezizonosamusowimi.pdfIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_e9f0a1d956c34c19aa75a7651739dbc5.pdf?index=trueIn 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_off00011282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11282 5348 bytes
SHA-256: 904d2d7f32fdeede3a5af4caf28ee0b92bf5b5afa39dc6fb429d58349c9581f5
font_01_sfnt_off00012493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 10328 bytes
SHA-256: 2da18e011cd2c77f48d6be6dcb7bef45d8c1d1bfe75810575a45fe74d5a81ad1

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