Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e410b8a7c1d2f12…

MALICIOUS

PDF

72.0 KB Created: 2021-10-03 15:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0b7273b40ec0bed7dcaf978b61faea14 SHA-1: 7bbd5a7d6bcac5caecda6cf57a75ea18ef865270 SHA-256: 8e410b8a7c1d2f127cac79e7bbc9c08e0a06dfc2a87a76a3661dca7aff719c0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to a link farm designed to host many other PDF files. The primary purpose appears to be directing users to potentially malicious or SEO-manipulating content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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 http://ilonew.tasksplan.com/ckfinder/userfiles/files/zukesuguzupi.pdf In PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/mevutibalabulaliluto.pdfIn PDF document text
    • https://soechi.com/userfiles/file/mugafotulaviladu.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/zoxope.pdfIn PDF document text
    • http://kohaz.hu/files/file/46819622453.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/6872716859.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/gajigezedavotajadufes.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/betomofadoda.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/92609940912.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/mefowivosamesugifale.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/91147725143.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/4306253235.pdfIn PDF document text
    • http://szwygs.com/upload/vuriravupexideraxal.pdfIn PDF document text
    • http://www.pilartangguh.com/file/kedotazoditumusigibomu.pdfIn PDF document text
    • https://vos-web.nl/userfiles/file/57984834869.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16156fbe5c7710---zugoxubuti.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210921002241.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109210733115819.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/44429443021.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/tawewurilaxejo.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/97481389799.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210927130620.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/64515371782.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/monoxoxorujiraterudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=icarly+crossover+with+victorious+full+episodePDF link annotation
    • 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_off0000b1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 17708 bytes
SHA-256: 415bec835c0740e77d9490f9f25d9206bfcc438a50fb8699f853c1ab1a715597
font_02_sfnt_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 10932 bytes
SHA-256: 6c1ad67940445ac006548141d1dbe95a897a0aaf8798dbd24ba87086e15180fb

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