Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6abecdd21c97bd3…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 06:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e55024fdf6305f28bf611060d8c81e98 SHA-1: acad2bd7fd04cc622ef4a38d82f4e95e67c6b1b8 SHA-256: c6abecdd21c97bd31eff31d25b978c133eac213a93c84bea3f177ea7d9daf140
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior, indicating a high volume of links on distinct, potentially disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://audreyheselmans.com/_files/file/jivupimujeva.pdf In PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/73443375779.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba568324e---60638225129.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/wugumuzuzopudog.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/votusokevedewopubedukaz.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/16549812709.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/tanarufuvaluzakutowidubek.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/wilovitimapunix.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/91169763408.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/wuvixokimozebunorofesi.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/woxeroli.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/12894698617.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109240647524559.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qu0ul22mrdajrcnmn4plrb08ar/27163246778.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/13299989588.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/21947174551.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/77942348941.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/41085450885.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nafaja.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/sotinadovad.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/fofikirotivevu.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/81478556540.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/53043698335.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/54966853958.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/92381455469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+go+eevee+name+cheatPDF 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_off0000afd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 15124 bytes
SHA-256: f71305d9ba1e398cc5a01dfadee4f4fd41f3c1a917e07901f0b194e0e2029ec7
font_02_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 10432 bytes
SHA-256: e4698f210894547db6bbf9be89d73e21c8254a1f59bda8d11894855f8194e6b7

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