Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a941f50bde9f66…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 18:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 91749f639f76fa4474b62ba386771647 SHA-1: 975ea432d445ef655bbfae294d1849babe45575b SHA-256: e3a941f50bde9f6607bf5e75ac1cc118b24a36ee30ce4bb0c5080fea25a88994
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to PDFs hosted on various domains, many of which are unknown or potentially disposable, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

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://kripasec.com/userfiles/file/podubolisikofadeto.pdf In PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/kifevulago.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/xosobuxejer.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/fagejutofi.pdfIn PDF document text
    • http://citty.org/images/uploads/file/84834465721.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/49705112735.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/89107092794.pdfIn PDF document text
    • http://state-lithium.com/upload/files/bomidogoramimego.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/zesagitonepo.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/44848472181.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/4148033490.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/33386961071.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/43664311171.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/midonigob.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/nosuzijikulokozamup.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/vapubuvevulijixukutobis.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/darugilebumoru.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/tefulupojizoni.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/kazitedebe.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/89736193112.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/99568854233.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/78377804850.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/jakenipimokanav.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/gexoratulogodu.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/55276854533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+games+august+2020PDF 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_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 17804 bytes
SHA-256: a4934ab8c2916722efc0156dfc51d4d9503d827c34272d94d250d931fe1308e0
font_01_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 10384 bytes
SHA-256: dcefdcb94ed9b90fc01e860ccd4ccd7bcfee04416a28562129e57f00d1963b37