Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cf3925b4e10afd…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 04:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32edc000515e0266247f68799e286ab5 SHA-1: 6a1f5a90c1873595959cac521cf08dcb6f74afe1 SHA-256: 91cf3925b4e10afde5197ae34949d68ec784d627fc4cf627f302344686161e2c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed for malicious purposes. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://collegium-connect.nl/ckupload/files/mejexuxobekexu.pdf In PDF document text
    • http://vivatbacchus.hu/files/file/kowupow.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/14130960771.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3c1d502fb---vagobiru.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/64886298990.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/98589876464.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/30776532118.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/bofotisifelixu.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/mojadukebaviv.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/21186208834.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/xilosopetepikejejekifeki.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/91453679543.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/wibabub.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3b45548ea8037db6dbd6ba8714921a91/duroridikeb.pdfIn PDF document text
    • http://www.bandungmesin.com/file/39387141577.pdfIn PDF document text
    • https://phuquiland.com/upload/files/99071340486.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/38284172939.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/70047269353.pdfIn PDF document text
    • https://castel.ro/userfiles/file/legasipililolebanani.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/kipotowadopaxu.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/20967330931.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/tanumabodixuxalog.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/97219665368.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/dofobalujujon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=yts+movies+app+downloadPDF 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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 17904 bytes
SHA-256: 4a5a7ccaa64d3ee3e55ad7093a01fb14d56f173c30be7cd9a757fa14bfd2eee8
font_01_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 10588 bytes
SHA-256: 9c8ac7c53100651c2a780b067bc7b1c6b9024c93579a39c09ddcef76fc71dc47
font_02_sfnt_off00012264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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