Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af05b80fdb7dcb3…

MALICIOUS

PDF

77.7 KB Created: 2021-10-12 05:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bf0e13576ada8203cc59d843a8cc6e8a SHA-1: f73fe44edbf38c5d2982b9aae7c03e23720043a8 SHA-256: 4af05b80fdb7dcb365f662a0220412746f075897b3d5f1a65b9bb84b3d2b6f6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to link farms, with the primary heuristic indicating a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://airconbank.com/upload/fckeditor/file/7925797193.pdf In PDF document text
    • http://cermak-expo.cz/data/files/file/77271026291.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109200216415249.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/63866720996.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/juxifodobasokiramowaboguw.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/luzuk.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/kijudirofixiniwakaburoxoj.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/88813660046.pdfIn PDF document text
    • http://guitarenko.fr/img/files/vipozatuxawipofovoju.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/59030906541.pdfIn PDF document text
    • https://membermimpi.com/contents/files/dujes.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/77002792659.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/36439636219.pdfIn PDF document text
    • https://attack.lt/images/files/39698546100.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/laxomowiruf.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/xunelubiwo.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/37061453215.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/89689289722.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4252a442ecc90ad1cc48f5323dd52750/22591000099.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/zepapumatofokudulofu.pdfIn PDF document text
    • http://travellerisland.com/files/74067245106.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/kofumumasewaj.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/11576658107.pdfIn PDF document text
    • https://ka-base.no/images_content/file/nodudiditilufutepotiki.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/zepomuturugovigevesi.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/92348767839.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=cooper+book+of+cell+biology+pdfPDF 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_off0000c90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90E 10640 bytes
SHA-256: 6dfa45c0bf83a8f5b707a7d2ad99f07a910bb2bfc03fbce867752b45098593b2
font_01_sfnt_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 18424 bytes
SHA-256: 898d3ae23d9d89211bd9baa24f90e8921a923fcd9c94ac29e6c5107bc44c4277

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