Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2697fba81f95dd…

MALICIOUS

PDF

86.2 KB Created: 2021-09-12 01:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7990a0712a8ffc59cd4ba55e89d807a0 SHA-1: 7a705270d96261294cb9fb692c31d169a9a58824 SHA-256: be2697fba81f95dd003576330c7912a9e03ad7573819dadc89d70912d61730f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high density of external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=how+to+download+tiktok%2B%2B+android PDF link annotation
    • http://kythuatviet.vn/uploads/userfiles/file/3797205069.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/lupivedezuwipawinanufi.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210901192632.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/43022351128.pdfIn PDF document text
    • http://www.bandungmesin.com/file/51620820166.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/77191991475.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/21485137988.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/42326655468.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/gigataxokipizelomebu.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210901180834.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/gemuvul.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/zitudibupefojuvu.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/10572661995.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/27180976659.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/28766316693.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/32525553666.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/43619434768.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/65018598683.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132eea5cb6dd---foxijodovikinaxofitome.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/rakeboxizitog.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/50413212351.pdfIn PDF document text
    • http://besteva.com/upload/files/92461371252.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/47482233022.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/92206316065.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/loporuzutobij.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c706514e3---vutugepeligo.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_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 10108 bytes
SHA-256: 811e78b4ae1c7b9870d748e948f1ebcf0e1563b04e06bcacf123129432d691c8
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 17596 bytes
SHA-256: 82fab4c90646555f199fe1c429fefce12c367b7b41b40843051273ad8601615e