Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a71eff89b5c8cab…

MALICIOUS

PDF

76.4 KB Created: 2021-02-22 18:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 840ad38402f1d5867c39a2c1e22ccf2e SHA-1: 66d1572ab62e0ab288f8fb9219e8039b6eed7026 SHA-256: 6a71eff89b5c8cab78c26f9358ee3efbcfa65177035007a3eff1ed306e9e6aed
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

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://druttle.ru/strik?utm_term=buen+inicio+a%25C3%25B1o+escolar+2019 PDF link annotation
    • http://jinokawobusuzi.iblogger.org/fusionner_deux_fichiers_en_ligne.pdfIn PDF document text
    • https://bajixaxazuxu.weebly.com/uploads/1/3/1/3/131383864/jakofezez_godonadajogu_movera_fituxopemunuba.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/geometry_a_dilations_kuta_software_answers_2011h8qq5.pdfIn PDF document text
    • https://nedugapepo.weebly.com/uploads/1/3/4/2/134265444/b602628be7a.pdfIn PDF document text
    • http://endi-itali.space/311285203659vlgk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_5fe7ac678616f.pdfIn PDF document text
    • https://nonaxoboru.weebly.com/uploads/1/3/4/4/134467623/kuxomidanipikav.pdfIn PDF document text
    • http://gallery-shop.site/metodologia_de_la_investigacion_libro_sexta_edicion5fdx4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483336/normal_5fdc5417d9cc5.pdfIn PDF document text
    • http://about-igsupport.com/out_of_office_outlook_365_app_androidd6jxs.pdfIn PDF document text
    • http://nigma24invest.online/rujetemoh6fok.pdfIn PDF document text
    • http://arm-watch1.club/download_lucifer_season_3_mediafirefiebk.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/5879873.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jifunujori.rf.gd/27118612157.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/jammu_university_date_sheet_4th_sem_2019.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_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 5536 bytes
SHA-256: c8ec2428ac50757b7f505d804e76fc4b6dc4916dbf26b32204e65396119bd2c1
font_01_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 11624 bytes
SHA-256: 0d28173a22215db787f48262e2aa8ff9e7c2365c96504c5658f88721ab928759

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