Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b273a9b4bb5bbd…

MALICIOUS

PDF

73.2 KB Created: 2021-09-22 11:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31faf8150e0eb79c3d529cd7bdc3e5f9 SHA-1: b7f3eb2928453f2f2ebadf18badd59a071d578f7 SHA-256: c2b273a9b4bb5bbdb1bba46ac908a8e082523474c093bf109650c8b43ca3a482
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these external sites, which are suspected to be involved in phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=my+angela+unlimited+coins+and+diamonds PDF link annotation
    • http://capitolmetrophysicaltherapy.com/userfiles/file/52999424722.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/59345860324.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/9570505640.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/zilewibipaxur.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109180438216154.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/kabejoxi.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/rovalemodake.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/nupazobimuvususix.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/fevimigidusawijixelefek.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/65314981665.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/78680619134.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/nafabojurasoxevam.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/55420968914.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/wevegomunezas.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/27365541025.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142077e330a7---31595210291.pdfIn PDF document text
    • http://labradory.pl/file/gegopi.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/likofowovurekibana.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/20772887064.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/61199574897.pdfIn PDF document text
    • http://grossbuch.com/upload/file/xolowi.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/85094893732.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/vusanafozozivomidudo.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_off0000bbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 16388 bytes
SHA-256: d350df64c2bb0bbb7a3ddc92da2d8a768f3d70992dc2ace32059cd3f00c34418
font_02_sfnt_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 10820 bytes
SHA-256: 6d980ffd45b2d3e7fd1e3ee13f6f33562afac72be3f690eb1468e3c546d69893

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