Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e82fcb0679f1a8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-26 21:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07f83beb3558d078300ca22d25923da3 SHA-1: 914d13d6c8c32195d779998afefa688b2ed5233a SHA-256: 04e82fcb0679f1a856024cb0f1fc7a0910d36eaf314b5b1d1c312f5056982884
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous 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 initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=bad+words+that+start+with+o PDF link annotation
    • http://mdknoodles.co/uploads/files/5004701617.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210919_1564CA6F04DC60BF.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/62418790887.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/nimukifunanikupabuwigoji.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/45746006793.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/98556261839.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/68632092807.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/16211759311.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/32691728989.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/lowejobosujuruzipe.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/fulisotosobam.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/pikewefegekinilusajol.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/380761751.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/sokidagox.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/wolofabedujin.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/zufuwuxaxopexanajukeruv.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/wisuzisegaxaxirabunetita.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/zigexilefi.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/xenibevizafogusutukobef.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/10470662356.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/nosobopibuk.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458ae728443---dopepobikapakawepuvak.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/vuxadevulakimumuvox.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/dupanevu.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_off0000ca97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 21736 bytes
SHA-256: 4649d480d0fa0c152fb53a53880a56f960eb7925655fbde5bebd960d6cdd7ed2
font_01_sfnt_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 10204 bytes
SHA-256: 3fc95d0d7d8ddf151ed213340dcd2e71b3bafc349406d1b2bd1eb7588e73de9c

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