Malicious PDF — malware analysis report

Static analysis result for SHA-256 443dd5a72c347264…

MALICIOUS

PDF

77.0 KB Created: 2021-10-06 01:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f615191cdedacb150ef58253a549ee8d SHA-1: d681834b0e3d19d02a3f5e86b0a3674c3a84fa75 SHA-256: 443dd5a72c347264b33420598ab017897af00a875e78494e9aae501cf868d1c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and multiple external URIs, with one pointing to 'infrive.ru', suggesting an attempt to redirect the user to a malicious site. The PDF structure also indicates it's part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=to+meet+the+real+dragon+pdf PDF link annotation
    • http://dentherapia.hu/files/file/luvubunesalejegeg.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202110030224537256.pdfIn PDF document text
    • http://fnathservices.com/upload/file/14143160874.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021920923355315.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/53034043855.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/detigemujuzazuwugavolapef.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/31672401782.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/1765735389.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/20294227303.pdfIn PDF document text
    • http://koreapyogo.puruemi.com/userData/affis_board/file/gijefevimodudunofazu.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/21946988491.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219211133396321.pdfIn PDF document text
    • http://inistor.com/ufiles/files/badozutakafini.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/pabubojivolegaj.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/57761581501.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/41850054526.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/mamexarukas.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/74696408438.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/99150357731.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/sapuleguxititi.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/sijadisumixogof.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/87401012623.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615182cb5b6eb---38752933381.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360172842ab---34129757330.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_off0000cb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB31 16640 bytes
SHA-256: 3c6267719eae7ba0c53a4afea77c9bdc94e0245735046b14ccef7196325e8b06
font_01_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 10648 bytes
SHA-256: 6d02228218d632fa396bc5edead23d4d6166cfca4526b35955c3c29da897ab86
font_02_sfnt_off00010e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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