Malicious PDF — malware analysis report

Static analysis result for SHA-256 299f23b9b40102b4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 06:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb344b74960e1d4dd368288c0d9a286f SHA-1: ab561f4c0ced61fcc225a6d6ce873df47d7f18a9 SHA-256: 299f23b9b40102b4ef1b367e8c0fef6e85ec0d9b19525bd93eec936693687835
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a large number of external URIs, many of which are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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 https://oniceh.ru/uplcv?utm_term=balancing+chemical+equations+class+10+worksheet PDF link annotation
    • https://maviet.vn/upload/files/kevajawubijebidivomenem.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/taxedadulu.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/49370714961.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/52274532452.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/2939151557.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/xoxakofudoluwojebukeku.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/77679985375.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/putemisolaxeliwigoxo.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/guwosifunoxolunesufovigov.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/60681465699.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/girufowofu.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/gonexukipukus.pdfIn PDF document text
    • http://budka39.ru/files/82873271556.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/56966731798.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/pewodagi.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/kobinobokataxir.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/76286043748.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109111501138413.pdfIn PDF document text
    • http://mamitobe.ru/files/file/gomekivison.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/26117fdb943484f9fd2d3a3c8b310399/58134426507.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/soronenimiwinusik.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161469ea07d1b1---58852185838.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/toxijifokawiwovaxakud.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_off0000ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 17372 bytes
SHA-256: e8093e232e59aaaaa2e7c97ce9d4fb194d59c011d1c5aaf96fc673abb9459f81
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 11328 bytes
SHA-256: 98942b9227a0cc7d813a936a8a2a30b1cd5f0015f6595953880105fe34662651
font_02_sfnt_off000115c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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