Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aaa32a12615c90a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-21 09:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b80b056af00e71c845bad2c3d9da4004 SHA-1: 100b92bf736f502d30018f98dc1ea0e253ebd8c8 SHA-256: 8aaa32a12615c90a0defefe649531f7edcd547bfccf02244d670ae80a3c626f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many using UTM parameters, strongly suggests a phishing or malicious redirection attempt. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=billie+eilish+the+world%27s+a+little+blurry+full+movie+online PDF link annotation
    • https://rowsontw.com/shopadmin/upload/files/zodikewemejotulewo.pdfIn PDF document text
    • http://billsky.ee/files/file/nilasepopokitawenejes.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/468102bdaf395264f8b497df355bf943/rumeparasilo.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/62872006878.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/vuvixojinunuvuv.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/mafokizaduvosijezasudez.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/muxozinedaga.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/vitexerikinadedaruga.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/vepetesun.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/8682146022.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/71053343004.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/16352131103.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf6db747ca---dewesenemalajiga.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/wegoxopopabibepiwani.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/2106502296.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/falabuw.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/51547177800.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/radusuwodegakiwekex.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/baweweraromixipagitejuk.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/42781677581.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/losutug.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/24563237577.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/xutetelapafipokopumo.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/78694455011.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/80624094453.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FA 17044 bytes
SHA-256: a1f7f048107a67a3e6d853bb06dd9f87bafd698140ef44f1f8bf6bdc9ed88cc4
font_01_sfnt_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 11212 bytes
SHA-256: 217132e406df0462458c47dee5b396bbd2dc67eeb88d2bd47531727bf2701768
font_02_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1