Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5191b138fd00a6…

MALICIOUS

PDF

92.5 KB Created: 2021-09-10 23:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cca14cecd20eb68d65a96de8c2d8ee0e SHA-1: ce4aa471802f313f0fc35e28c5a534696631d866 SHA-256: df5191b138fd00a6834b90991b77c9f9e04690bfc0d7cb534f6c6e63cba6bf2d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to potentially malicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high number of distinct, low-reputation links, suggesting an attempt to lure users to external sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://mikomisushi.com/uploads/files/48447073728.pdf In PDF document text
    • http://imcborivali.org/userfiles/file/4659585991.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/mevad.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/93655343634.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/93564038628.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/volutupajija.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/pifeperoritasipofiko.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/dowoxudetasutopi.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/80027251541.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/21831611713.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/21036227793.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/hui3o1dri279hd44v8os2nv3ph/zusoxatepuribavekugudex.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/44546688834.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/67062586026.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edc8b8e4ff---fanibefufibemirinopozuxog.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/wademiwopenujoxi.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/1154244486.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/58333701495.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/tilidubaxufaxaz.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/36254671768.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/91039306333.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/16649949006.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/35807373906.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/75159656719.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/sabexigepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=amiga+games+for+androidPDF link annotation
    • 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_off00010239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 19440 bytes
SHA-256: dbac94762894ea54de13a4b0836bdc3d02cba474a93ade7964570689f043a3cf
font_01_sfnt_off000134ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D04 10536 bytes
SHA-256: d47a328755cf8dfe8ce3de8ef75d7ebb5b3912dd34b628bd6a82876cfda34191

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