Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed14ea6cf8637f26…

MALICIOUS

PDF

78.1 KB Created: 2021-09-23 11:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6d969db47b1edd2fbc6a48ed439afa95 SHA-1: 3708a01be0b378896abb28a4de9c0cac0193ac03 SHA-256: ed14ea6cf8637f26a58f29ee2825662106bd03bbe7e157733c43c26c4dac1965
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=android+sync+time PDF link annotation
    • http://uekekb.ru/!upload/files/lunobubamafofefodinerumiw.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/xujuzupelopufetinufuxoxi.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/kemubatadojukozazobozunex.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/tebitovarelerafik.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/kimapalagiwopilivata.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/vesibolufazase.pdfIn PDF document text
    • https://revive.fashion/upload/files/lokawasupodowaxanilaz.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/bubixawumojukibe.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/97471170628.pdfIn PDF document text
    • http://mastervin.ru/files/file/51483742000.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/86284450105.pdfIn PDF document text
    • http://olympusflights.com/files/files/30360093330.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/tosukumulamuveje.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090207461073499.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/20116010377.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/5577747700.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/kekevofidusipesisolewu.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/9658098098.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b54e0587eb6dec5974b82e7b645f4205/bubitirewekofa.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612edcc92c69c---dezetabutufaxiwi.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/58643390548.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/nipanifozid.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/75263805075.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/71283114575.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210909/16311341149491.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_off0000cc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 10420 bytes
SHA-256: 96c4c7bd6e8e15171ed28eb82e3a994734ec69ace5f9acf3e12fe7daf0543834
font_02_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 17772 bytes
SHA-256: fbd2b7b643fdb9a08be66962263904eff7fcf63e9a96ef9b0876792498263aab

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