Malicious PDF — malware analysis report

Static analysis result for SHA-256 9290120c2a7981da…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 21:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: df9959a9f3db9e024a31e1fe224ed67e SHA-1: 6d8a6bc8f7dc8c99064326132605a70d73925ae0 SHA-256: 9290120c2a7981dad3b0c0143aa895d004f172178386577753f007d4e4b59d8e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as software. The embedded JavaScript is likely responsible for redirecting users to these malicious URLs.

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 https://pixomot.ru/uplcv?utm_term=need+for+speed+game+free+download+for+pc+windows+7 PDF link annotation
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/sajanerawutegakapolupeza.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/disaxivukipobotefum.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/84618321991.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/62428175652.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8e9e7dea8---25502263280.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/90656330014.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/foduvomi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fec75813bc1042e1706eec9420533d21/17411748617.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/gidipivudazokumajadi.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210904000104.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/xikis.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/46698246519.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/wevosadojedajixaxaxejuta.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/lidezidovakomepip.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/44477595857.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/noduvapo.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/fivolakas.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/80184699609.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/10502989466.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/muxusor.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/dazegoj.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/91570187220.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210911010656.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/48163904177.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/10202730543.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_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 10976 bytes
SHA-256: 4250626ba6e287b721165fb4f2a484bca020702e099a4bba7a085ac15d31a4ad
font_02_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 17400 bytes
SHA-256: 12d2919e2c4518408f370b45ceb93deff94dfcaa77521612967d46e507107d29