Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c42ec3a0d8abcb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 21:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5de3ed9d7234e9b472ba7d0787902edd SHA-1: c94ab9e18d55263b3f3716f15f2c09d261440bf4 SHA-256: b2c42ec3a0d8abcba9ede2174872174dd7841bf1c8c84678646b09354b308a7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a delivery mechanism for malicious content, likely via embedded JavaScript or by redirecting to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inwebjor.ru/uplcv?utm_term=intellectual+and+society+thomas+sowell+pdf PDF link annotation
    • http://seattleteriyaki3.com/uploads/files/77732313291.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/nizufupifigoxawid.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/gerasido.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0ffo0qf9npbjr0qkflr3d68uv/51100937810.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/21478366569.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/pesujawowefigak.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/76982165976.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/pumerinuxuxujewojafap.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/33968890482.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/60187315829.pdfIn PDF document text
    • http://beijingteye.com/upload/files/89078520254.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109051924425195.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/69828116150.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161339ec2955ef---geguxunigolabonuvo.pdfIn PDF document text
    • http://air-con.ru/upload/files/24340735903.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/3548078925.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/jaturegabadisevuledaloj.pdfIn PDF document text
    • http://strandedtattoo.net/file/9094395300.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/28264915227.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904075353273918.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/nuzorulosojofedulifu.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/mixikadoraba.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/40885910772.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_off0000d88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 17660 bytes
SHA-256: 7e73b72cab0a22176f23784bdecc2eb087c67376729109ba68737de4e9b3b371
font_01_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E85 11036 bytes
SHA-256: fb18ca4b111b7a2b89536c4220b5b182fc2152f05f8b70e707dd5453198417f9

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