Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ee970e666eb03c0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 06:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: adb5399a7e3606dea95f4131038cfd56 SHA-1: df0296ee43b10ace05320fe91a0de1d953646572 SHA-256: 0ee970e666eb03c087c047b8b3c9b1bf8726e7479501ddec7fc18e4b20a5bc24
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely for phishing or distributing further malware. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://cructi.ru/uplcv?utm_term=words+that+start+with+f+and+end+with+r PDF link annotation
    • http://sztarmedia.hu/_user/file/mixelorotimaxo.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/14577023883.pdfIn PDF document text
    • https://medtek.vn/storage/file/87413202207.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/tufesamexex.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/22474671435.pdfIn PDF document text
    • https://adium.ru/userfiles/file/72204153347.pdfIn PDF document text
    • https://sealskinz.ru/files/file/pimosejetodoza.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/miwigomekitibexetagop.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/6999239248.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/tegid.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/jiruw.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/tamotopavevinodenowupetip.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/jemepalenimumogugoxut.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/nuzifavesosadotelafofumig.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/72502051793.pdfIn PDF document text
    • http://fnathservices.com/upload/file/sobedazoxokugixujesamudot.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6140588100.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/21295195963.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/razarudabixabifar.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/fonovujijuwifoxovimujiji.pdfIn PDF document text
    • http://sinostandards.net/upload/files/zamusemofiwox.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/wuganamosur.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_off0000d487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 18400 bytes
SHA-256: 68d8971fab508f319befef15e8dd2f9f1b853c9d90b8739ad8ed7eed36ea2dc2
font_02_sfnt_off00011be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE0 10484 bytes
SHA-256: d5e8ce8d6bc6cd2cc9bbacea002b511583d59d2a2b63b5de29212bd3f9123ce1

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