Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b653e2a8be968b2…

MALICIOUS

PDF

81.9 KB Created: 2021-10-15 16:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 247b0f3c3d205e2ec624893504a76d59 SHA-1: e92eb4857d1b23662745a47eacb9fb419369d99c SHA-256: 4b653e2a8be968b296bb8ca9b301c515032ccc643df616bbe11471d9628429ab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gewidor-gmbh.de/uploads/files/nafegerapigotamuxeka.pdf In PDF document text
    • https://zoorichi.com/temp/fckeditor/file/88327230184.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/kojafebi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/juzewenufejo.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/wujimokimu.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/36108016173.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/salofesip.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fojivoberilujuw.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/kazegariramazuxuxige.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/jokujazuzosesulimane.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/54067411261.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/bipolodututebowug.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/93965192008.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/47505707071.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/63303971115.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/parefufija.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/76842039469.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/makunepolijib.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/zufuvodirozovafunilukaku.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/admbg1ubvdv1it7tg23eahp3iv/wizirodivej.pdfIn PDF document text
    • https://adikketiga.com/contents/files/lapogesaxunute.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/gexasobatu.pdfIn PDF document text
    • http://cityyeast.com/userfiles/file/xaponutiluvizew.pdfIn PDF document text
    • http://jawarakreasi.com/file/62401243828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/vItLtdF7Pec/uplcv?utm_term=license+plate+agency+mount+airyPDF 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_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 17448 bytes
SHA-256: 7559990b5bdbf24af47e13c810813c572412a72706c9111df7a55c3f60129b6b
font_01_sfnt_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12091 10888 bytes
SHA-256: 0458df148cc8b7fc483e0356205159863274a51b0b1e5bdbcff2eb5124a9fd49