Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9880b19009f41c3…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 23:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ba02e41cc1b5cf3575a2793f8c1d503 SHA-1: eb7ba7506b80eb3b0a5864d362105ad7b611df84 SHA-256: d9880b19009f41c330146a15c6ed269c3b2f2c161c22af62f22b10e4a3d5e74c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ettermanenterprises.com/ckfinder/userfiles/files/zovuxadosep.pdf In PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/xawenosuzo.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/3902329782.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/5008945231.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/74437413436.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/roluvup.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/gekapokepogu.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/62797121623.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/jalezixutewepumewexodim.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/32396457585.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/wamamekem.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/girotajofakogufi.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/86561126544.pdfIn PDF document text
    • https://almavilag.hu/files/files/jimimidokelaful.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/81818433751.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/36588533746.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/gotewajenex.pdfIn PDF document text
    • http://shamayachts.com/upload/file/81057591862.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/rinisugaludazena.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/sebazutazimepizaje.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3fcf3db3---86991119581.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/85153120155.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/59ab9cfdd8eb829f9242a6a97d52c228/75283178041.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/rinoluxufulatosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+three+dots+menu+icon+missingPDF 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_off0000c08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08B 16992 bytes
SHA-256: 1f2088b2c9a01b2ce14c3e45e1de7680152412bb734da2de238c0316495c5185
font_01_sfnt_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 10692 bytes
SHA-256: e3d8adcbb35b6f4328b718d82dd6acab815b6930d64215482121465630396a8e
font_02_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1