Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb4476860808a44…

MALICIOUS

PDF

74.9 KB Created: 2021-09-11 18:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 416e2e189456f604489232b5eca5be60 SHA-1: 6e26cd7b8880db4679a29f6a7cd4516e796973dc SHA-256: 3bb4476860808a44da79872c594a9d31a4155eae57fe372b503afb6b5990d8dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The heuristics identified the PDF as a link farm with numerous external URIs pointing to potentially disposable domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86196260067.pdf In PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210911_26A22E9E904969E2.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e2c337b04---bokisefekoto.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613829fec3922---basadasilowagibikogonutel.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109030425563182.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210902021342.pdfIn PDF document text
    • http://grimastone.ru/files/sivevevaxeboza.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/79595009392.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/11748876854.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/13486989959.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/zatasosuxapu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lerolabugoderazevufuji.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/97007484179.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/22489863015.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/97549367843.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/98846018265.pdfIn PDF document text
    • https://somogyplusz.hu/files/54713697705.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/21695129837.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/takase.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/10056609275.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210907001203.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/regukoguje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+background+transparent+in+androidPDF 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_off0000bc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC70 18464 bytes
SHA-256: 8f20cf4065df5fc3dd31e141ff8d7416b65ea70c30fd9c4c3fa253fddd99752c
font_01_sfnt_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 11220 bytes
SHA-256: 2dc962f0aab544c9cf7ed89b0c4734bbf67d03df1882537476292de20d47e580

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