Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e337fa6d04e01bb…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 13:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8dd3cf9f0a319a77cfc24da99f8444e5 SHA-1: 15a77d5721c81166f3a78be7e5fd7cfc8541e3b9 SHA-256: 9e337fa6d04e01bbce5d8a9e0c798f3495ecab997dfec2bb29298654cc6caefa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to direct users to potentially harmful content. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://tndgdemo2.com/ckfinder/userfiles/files/kulimutusotinafuluxugom.pdf In PDF document text
    • https://imaggu.com/ci/userfiles/files/vajovoxuzoxokobe.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/rotifunasijo.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/21482436962.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02f1c518d---zojukiwexodupe.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/23133951874.pdfIn PDF document text
    • http://exima.kr/userData/board/file/limoxinapifedozow.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/tepaxedufopurugajexug.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/gazogaporomo.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/7276985691.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/sesakewivowijidez.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/biwizifutagipasol.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/paxitesamuwejitetovomar.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff6b1e0185---xabenuxojemapurepobo.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/77280426474.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/bapilixinug.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/tidokaletabilo.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/xovobopunuwomagi.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/99845440136.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/36120157020.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/93574692818.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/36349694738.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/varumitujexemewekado.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/92790065127.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/fiwaxure.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/luvusolizagenesevogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=m4+screw+to+imperialPDF 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_off0000ce86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 10588 bytes
SHA-256: d513739fb797208258a0cfc9c163ddb252ffed6d6c9b61e174163af48c23ba78
font_02_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 17896 bytes
SHA-256: 3ff224dceb481fc5283997f45482a7d3be79b2a616384badaa1549a1a4e25b6c