Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc6865216d56c6c…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 16:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33e4fd45018a47717b7e8902a4c11859 SHA-1: 6397eabe69ea31fad3d61cb5f3bfb8e431b9ddd7 SHA-256: 3fc6865216d56c6ceb0deeee792a01afc6c5b25fc6383d5089a6a832c5489de6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://oniceh.ru/uplcv?utm_term=information+technology+law+and+practice+vakul+sharma PDF link annotation
    • http://print-resource.co.uk/ckfinder/userfiles/files/22036863004.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/gifuzana.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/ditolariw.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/milotuzutefewesorunuporaf.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/roribodixixabosafutozive.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/14351094770.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210901_C323A0B22EC69A59.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/21696821426.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/13589739407.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/dasaxalozexata.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109200118353529.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/32932874704.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/vaxeketebolex.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d370b2355f788e237595a39eee4726a0/50370979015.pdfIn PDF document text
    • https://flomogroup.com/upload/files/39413967994.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/gopevubovegijujadi.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/29277075110.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/1306621472.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/36059822964.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146903e31c73---vebisemukojapobafixo.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/refuxu.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/moruwilalopov.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/37932093453.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/tabewejerikita.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/rinidolewirafotim.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/50888520917.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_off0000bcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDD 11476 bytes
SHA-256: d93e001267f0a257eef5c4a75bbcfc2b3218626efa27a741462ea50f72962ffe
font_01_sfnt_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 16088 bytes
SHA-256: 149700f4c4ca33c5ed6efb0f78c2002033c71fc57772444919a341ddc9ea66f0