Malicious PDF — malware analysis report

Static analysis result for SHA-256 798083864b77537b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 21:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 770894e68e6563b24eb24cd2655c2fbb SHA-1: a11828702d96abd3d394c9a4bed015dc8e746c4b SHA-256: 798083864b77537b4de0c95fb1753301893fc11929997337385a293861d409f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://wastran.ru/uplcv?utm_term=nava+kerala+lottery+result+pdf+download', are likely used to redirect users to phishing or malware-hosting sites. The PDF structure and numerous external links suggest an attempt to exploit user trust by masquerading as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=nava+kerala+lottery+result+pdf+download PDF link annotation
    • http://splogservice.ru/content/files/zigimuzevur.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/39328502336.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/gefavofala.pdfIn PDF document text
    • http://www.og2c.com/images/file/vagojederosabit.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/6169422160.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/15306772755.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/zexokegirutakejezemiw.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/mebametobesufolo.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/mafokabutujekuwas.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/gisawunenuxime.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/32219439010.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/19821615730.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/92609940912.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/ropul.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/30772562442.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/90781399792.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210906010638_3o1ke8.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/99956427420.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/pexamofasoro.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/48361394986.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/goruxak.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326210a18ba---sarobelazus.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/vujevanige.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/28862007874.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_off0000d283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 17072 bytes
SHA-256: 3080c46e04f19d8d859c88e1da269e90d00d949d14f768534ade9aed81d3686f
font_02_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 10832 bytes
SHA-256: a816db9cba09e9a32a01492c54016dc97f295a16a114b8c6bc7b02f9a7293f24

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