Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71eda9bc9098274…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 00:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 82dc7d8febea5ad9f81bd382a5286881 SHA-1: a62def00fbdf7eba1bb4912e20b852b9c2ac164b SHA-256: f71eda9bc9098274fe39083ff4ad7386a43d592f652c29dd390f7f7a83f3d22d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a high concentration of links on potentially untrusted hosting. No scripts were extracted, but the structure and URL patterns strongly suggest malicious intent.

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 http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161510dcfca962---genejanani.pdf In PDF document text
    • http://suaups.net/userfiles/file/fideriwuwirufejagewujiru.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/3433922614.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/sebev.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/47665827708.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/vetamolumevanawevodevirop.pdfIn PDF document text
    • https://linker.tw/files/lufevinobexenut.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/46487886824.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/rotemozofosinubisomaka.pdfIn PDF document text
    • http://195exim.com/datas/files/xapij.pdfIn PDF document text
    • https://agrando.cz/files/file/37422244629.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/69671290041.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/27574170617.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/kagobupazepusuko.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/13054658181.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16152335c02fe1---41316740930.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210928051438_csexew.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/zifejigawijami.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/fudafoxuma.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/dowipivanuku.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/lb3u6ib70jm6up67hniofam1f2/86618590906.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/kadimosexatubuguba.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/37412679470.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/fowixalunudut.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/wodowebazamukefaragifajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+remove+screen+lock+in+mobilePDF 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_off0000b4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BA 10604 bytes
SHA-256: 622596cf904016e4f45e37948bf532a818b774f14f9c49c17120623f4db148d3
font_01_sfnt_off0000ccf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF7 16660 bytes
SHA-256: a5f98623667f766433c3ec5aaa8707eff5a9f0f0b5b28a2d7b9456ab10847a8f
font_02_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1