Malicious PDF — malware analysis report

Static analysis result for SHA-256 91431fc7223b722a…

MALICIOUS

PDF

87.7 KB Created: 2021-10-08 16:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8f61f484b63e7215085a609c49cdd33f SHA-1: 7fb8a1f3c6744b086ffd73457384f5e41576d14c SHA-256: 91431fc7223b722a66e262b218a6b41cb648c998dd63d6d41af0bb891682cc00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm, suggesting a phishing or redirection scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to the use of disposable hosting for these links, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://pixomot.ru/uplcv?utm_term=comparative+degree+of+clever PDF link annotation
    • http://www.donboscovizag.org/images/files/razovasagag.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/55348747285.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/wesujinamofuxex.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/79241312303.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/nikogawadelanuve.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/punizukovunizizanusub.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/92833126280.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/xavamilanabes.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/sewegabovuzibugotugoxiru.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/58775664439.pdfIn PDF document text
    • http://raczpalinka.hu/userfiles/file/muduxupurowulajolov.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/jojazegupapopabuvuzibeton.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/21837028631.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/nekejetixowenefakifa.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/39157977749.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/gilatajurupuduwinivup.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161374324133b8---87714338927.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135d4f696a5c---binegojidiluvevukavuf.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/72811094840.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/kezubu.pdfIn PDF document text
    • https://dynasty888.com/image/files/20211004_213113.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/pevofopafiguvuzeg.pdfIn PDF document text
    • http://prestopc.it/upload/file/49619857940.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_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 20244 bytes
SHA-256: c41f81493989ed037b87f6e316d0fd34ab7dec62dcb5341d1f11eb7de68cd355
font_01_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001385e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385E 10788 bytes
SHA-256: 08882f6002fe85b5883dab36343e4457464b473091ec8e784a23ba6402f7e44a

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