Malicious PDF — malware analysis report

Static analysis result for SHA-256 744eb0bb26438ce8…

MALICIOUS

PDF

85.7 KB Created: 2021-09-23 17:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f4eaff88a9627bbb6e4cc6e2f7e72a4 SHA-1: 981a3bb9070ee23ebf5f765219623b94963697e1 SHA-256: 744eb0bb26438ce843b26515cb8732f3f7730962de4cb01cbb018850a757334f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to disposable hosting, and is flagged by ML and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host phishing content. The presence of external URIs and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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=giga+games+wild+rift PDF link annotation
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/67213303807.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/kifaravo.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/vabajapakodazobopisisure.pdfIn PDF document text
    • https://edarky.net/data/file/xevulodebugubi.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210915221435_lhnfwd.pdfIn PDF document text
    • http://princeverma.in/uploads/files/zupelegiterigugo.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/nonadugiwafobuzama.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/bogesefawixizaf.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/51682757128.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/wawepedijuzefiw.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/dedolasomifonorew.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148a6533b3b9---voperobikukumugexej.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b543028cd---27833193287.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/24680287591.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/89416402829.pdfIn PDF document text
    • http://scro.ru/pic/file/leluwosadarenofopuxilusi.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/nunavunitoduroxag.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/gimusepinabatuwapumigako.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/30233263891.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/vokuzidasuzi.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/35886704339.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/4845611163.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/naxolilemumeni.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/nezemipoxojuwubu.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_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 17820 bytes
SHA-256: 63bb0d9a21d58c9ccf2d9fa066d5b7008f894ee158aab08daa7af10a035f1364
font_01_sfnt_off0001191b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 10596 bytes
SHA-256: 0194875b761c442fb637d59c3507027ce2ac26f38ef9013c132227bd01d982ae

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