Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42a62ffb51ee2bd…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 22:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fef767fd001e7a92b54d70deca3e6c22 SHA-1: ba6b66f710c1b557bd4ed4387f16652d5edf1dc1 SHA-256: a42a62ffb51ee2bd1754806d85083644e6bb1f6bbf6b60288af1dcc66df6b51a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to a variety of potentially harmful websites. While no scripts were explicitly extracted, the PDF structure itself can embed malicious JavaScript, which is a common technique for exploiting vulnerabilities or initiating phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ckrestaurantgroup.com/ckfinder/userfiles/files/rutedotetodet.pdf In PDF document text
    • https://faktxeber.com/resimler/files/sodagijetoraxapag.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/87161683623.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/dalalukabomegizetotet.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/77589623883.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/redibokajamizig.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376fbd8526b---doxutamafakakije.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/13693391519.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/newitekixamajafobo.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/sozitote.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/772455650161631494039.pdfIn PDF document text
    • http://kaies.net/upfiles/file/bikenarapuredutiguze.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/gomenubidijuxavowuto.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/86344403012.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/givipusamifazav.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/forujesuzaponegofil.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/28599894948.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/11678726801.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/mapamusizekovapuvesodad.pdfIn PDF document text
    • http://koala-al.com/d/files/gozafaf.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135496e3c841---gisik.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/nikis.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210904_80078F3BD6574E83.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/96363337970.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/tananidikurur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ncp+vpn+client+android+einrichtenPDF 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_off0000ded4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 10488 bytes
SHA-256: 824125847b6f6bfc7b87e57c406807c080fbfc928d6f85493d1a436f73250baf
font_02_sfnt_off00010ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA4 17808 bytes
SHA-256: 2116ed33f3aa67739f16e39dbbd04d42e57faabe13cb6ead30b9dadc1ddc7616