Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac37e12fd5661d04…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 04:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 046a24bc438f0e67501e588565354249 SHA-1: a093a4da7b3218cbf9f85a5a249e4b1e95193293 SHA-256: ac37e12fd5661d04a062625e97715744280e403d273cb8785cd7e0b11c71cc94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting an attempt to distribute malicious content or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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=class+10+grammar+book+pdf PDF link annotation
    • http://goldcoil.com/uploadfiles/files/9885407323.pdfIn PDF document text
    • http://egitara.com/upfiles/files/57040226128.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210906172042.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/jabeketegubifivebizavasid.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/92061048089.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/83074156016.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/89452001621.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/90426553653.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/70213844625.pdfIn PDF document text
    • https://projetovm.com/uploads/files/tasatupezujolef.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/66554775484.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/maxawuxil.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/ziposipoborodusa.pdfIn PDF document text
    • http://turatabor.hu/media/kunonodozewofirijupi.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/xavirapupudomukoma.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/notimemidejofexasafep.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/60850540942.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/vepubakukipetenitep.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/duluputaduxuw.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ecd08e3ce---36776849473.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/boxuv.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/fikonadubapoz.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/74845601913.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/44213336107.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/31355615599.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_off0000bfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 18088 bytes
SHA-256: e7cbe8c3075d1d37288f98ecfc2d678a578ae8f74c4020d5074e703c2038f477
font_01_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 10852 bytes
SHA-256: e75547b96a88f47b321245a9c76383986338d38ad57ed72e5e7a1ccb45955268
font_02_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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