Malicious PDF — malware analysis report

Static analysis result for SHA-256 60133eecb1b7caf9…

MALICIOUS

PDF

97.5 KB Created: 2021-09-18 06:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b31a5963303b76f8aad466f7e361babb SHA-1: 03ac86c41b4159ffdac983321004c8a2f4b88f66 SHA-256: 60133eecb1b7caf95f384c604a31351565d3ff7f79ae3953a7d62a318e0180c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF hosts numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs point to various domains, likely serving as lures or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=crash+bandicoot+4+it%27s+about+time+download+pc PDF link annotation
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e508765707---povas.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/fuzumofosozituk.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631342734.pdfIn PDF document text
    • http://letdentalab.com/img/files/49812135047.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/zogiwotus.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/xuxibamovebura.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/88833158184.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/78642923787.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/80562688832.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/fokopovani.pdfIn PDF document text
    • http://bscartridge.com/pic/gapatomegafuwakukijax.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/rikofekefeveri.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/valulixexiloledataxe.pdfIn PDF document text
    • http://partiaweb.com/upload/files/zajuz.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/baxudukiroz.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/37526862021.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/33083049105.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/72091486621.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/mogalotafojixo.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/movofiwobotebowadoz.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/51bdb02aba85f2a32252c61f9316332e/gilalexovadas.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_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 11248 bytes
SHA-256: 283999d9f9c60172f25c4bf760c1c30a0886e92521ea9d1e6ab18e33add72042
font_01_sfnt_off00012eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 18764 bytes
SHA-256: 585a2389c81116408f756c64dff1c28d34e66d6234777b6e9f22e6476161d103
font_02_sfnt_off0001606a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1606A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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