Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f1d22effa34c2a…

MALICIOUS

PDF

69.1 KB Created: 2021-02-22 14:38:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 76a52fa6f3be6a7643d585694c3f0eca SHA-1: 8615a5f04542bdf754a5908b2eba061c6f545c9e SHA-256: f6f1d22effa34c2a9d12b5eae76b6f919ad5c70df705ce0a78f77f7c51c9216d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a tactic to obscure the final malicious destination. The document body, though heavily obfuscated, appears to be a lure related to educational materials, likely intended to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=envision+math+grade+5+workbook+pdf PDF link annotation
    • https://vobawele.weebly.com/uploads/1/3/5/3/135334277/1054fc8e81.pdfIn PDF document text
    • http://milesnires.xyz/37943995541080mf.pdfIn PDF document text
    • http://vasazuruxu.iblogger.org/interview_questions_and_answers_for_civil_engineer.pdfIn PDF document text
    • https://fifikasato.weebly.com/uploads/1/3/1/4/131437502/sagavatemurojom.pdfIn PDF document text
    • http://cetapp.xyz/tavorgp7hl.pdfIn PDF document text
    • http://frasqen.online/weather_report_for_grand_rapids_michiganl94co.pdfIn PDF document text
    • https://juguzitusiketi.weebly.com/uploads/1/3/4/3/134372303/9262308.pdfIn PDF document text
    • http://netewe5.xyz/74270500350zl2tu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dufijofitaj.epizy.com/kingsbury_school_erdington_ofsted_report.pdfIn PDF document text
    • http://xenemusexo.epizy.com/57094409014.pdfIn PDF document text
    • http://tipiwozametorol.epizy.com/que_es_un_estilo_de_vida_saludable_brainly.pdfIn PDF document text
    • http://dudakitulefuteg.rf.gd/software_carsoft_7._4.pdfIn PDF document text
    • http://bogasupi.rf.gd/xesijewozizote.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_off0000ceb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB3 5860 bytes
SHA-256: fcdb440078cb33ef445f8d8899830776acd58f9ccf7fa337dc02315795fd2b5e
font_01_sfnt_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 11004 bytes
SHA-256: df65f1f3e0a08bc1bb8d49e318083bbb09a8280916405f87401f72cc6eb36063

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