Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea70b18191853cd5…

MALICIOUS

PDF

78.4 KB Created: 2021-09-14 09:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a245297ce5679935ab5417f7378f6c2 SHA-1: 4797a42ff18aa0b62185a29aff8f704745db8cbe SHA-256: ea70b18191853cd501e6c3642c616222f1558f5b32f5f66366b3415b51c3ffd9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wastran.ru/uplcv?utm_term=compare+galaxy+s10+and+s20
    • https://nutrishop.in/ci/userfiles/files/81558422691.pdf
    • http://esistore.de/userfiles/file/xilosikobarolek.pdf
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/11868110317.pdf
    • http://www.gonouvellezelande.com/files/71376677977.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/49390322604.pdf
    • https://koratspring.com/upload/file/10083092514.pdf
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/mejov.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b686b8bc---jikuwoselemedekorod.pdf
    • http://ppogrimall.com/upload/editor_image/file/68451866845.pdf
    • http://capitolmetrophysicaltherapy.com/userfiles/file/mefuvufejegarinof.pdf
    • https://ntiverification.com/userfiles/file/polezel.pdf
    • http://thanhnhomdinhhinh.net/uploads/files/61062496636.pdf
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/gasijus.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c8174d8ada5d67708d64ec7a71c60044/94080951546.pdf
    • http://allamericannursing.com/userfiles/file/xijabegetivetolarivugata.pdf
    • https://securitydm.com/slicice/file/menuzaj.pdf
    • https://ms1oke.com/contents/files/bogasuvujatixavo.pdf
    • http://chugguwang.com/files/fckeditor/file/kelikivuvijaxaned.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/67936269664.pdf
    • http://esipro.be/userfiles/file/tugifusozivuresi.pdf
    • https://nk-sostanj.si/files/file/97403803541.pdf
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/sipodiwufusu.pdf
    • https://xn--80aaijzh9b.xn--90ae/documents/file/regoko.pdf
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/meremojumaniregamezep.pdf
    • http://tercovci.cz/files/file/vuzopivuvex.pdf
    • https://twinslock.com/ckfinder/userfiles/files/wisetemaj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 16792 bytes
font_01_sfnt_off0000e3bc.bin
863ff2bba343ce078f5eb9b1cd76d3043e7bfa3c39c39b0600fa40693ff6dee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 17636 bytes
font_02_sfnt_off000111cd.bin
ddb35375f2733e26d2020aa7fe9ac475b1c46a32fff185cc5ebf7f5f351e299d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111CD 11084 bytes

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