Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca610756168a6cf…

MALICIOUS

PDF

92.5 KB Created: 2021-09-14 03:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be6308bf761e9f5ec2ae31193d5e7f03 SHA-1: bf30677bbcb598ccf2c4372a47e52ba841ed22d8 SHA-256: dca610756168a6cf16150b96898a1f5f6df46623d040069c223dd13ad95025f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest the PDF is part of a link farm, with numerous external URIs pointing to potentially malicious content. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate an attempt to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7rrpmk5mgb2fucm4g5dtef25ds/64443169548.pdf In PDF document text
    • http://wenxuezj.com/images/File/81977307599.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/90948768768.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/lajegaxun.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10178414579.pdfIn PDF document text
    • http://builderall.info/userfiles/file/kavazot.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/zefidopesokegib.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/81654627238.pdfIn PDF document text
    • https://umartravel.com/files/42141754588.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/depinuwujuxagizo.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090621313373499.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210902060809.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/177718478.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/gagudufoloxu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373901e9fdf---55327137193.pdfIn PDF document text
    • http://iltorg.ru/upload/file/refajakipasoxigulu.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/bejasonibonegigejonu.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/tusefap.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/89612945277.pdfIn PDF document text
    • https://suruburi.net/mm/file/zudobela.pdfIn PDF document text
    • https://parkettworld.com/upload/files/62741254851.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/wiginevajijewan.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/48049419777.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/futazejewovis.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/fufawevunajilubix.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/fakimunizuvevi.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/wafufowuroxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=war+movie+123mkvPDF 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_off000107be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 10348 bytes
SHA-256: a58301d07a04bfcbcbd80f8fcdccbd4a5b50ee2eee04826e2dece78b8838c996
font_01_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 17228 bytes
SHA-256: d809e77f5878ed0b0e7122eaf1510b70a382106979d75c6a3bd25166f3f777e9
font_02_sfnt_off00014bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1