Malicious PDF — malware analysis report

Static analysis result for SHA-256 165897d980ce602d…

MALICIOUS

PDF

88.2 KB Created: 2021-09-11 18:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1c8941be6bdd7ed232449df7ca5a0423 SHA-1: 4c3342470f38a1d8afb70b85d5c2673603d10433 SHA-256: 165897d980ce602d12978f3fedaef4389023dd5ca0c12c5fa10baa8ec338f819
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://wajl.net/img/file/20219602536.pdf In PDF document text
    • https://hsse.cl/files/77324711154.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/2771673712.pdfIn PDF document text
    • https://ccskin.com/geektic/files/lesalerimati.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/93878173924.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/68569164785.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/rewuvizu.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/gotitiropubixig.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/64087136850.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/pimatebupifetaw.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/bowetirukokesadajev.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/84876388144.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/tilererawikuketonat.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/xoroxejawopaxebezote.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/86767290409.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/59350635101.pdfIn PDF document text
    • https://hoavily.com/uploads/files/lusaladazorupezitelinowul.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/fekumojuri.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/76997210426.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/mugil.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/dapovozoma.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/xezadumomexatalujaf.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/63110823836.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/rodemagujanotegaboton.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/68791203363.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/gakediworivirajiboturajev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=merge+pdf+files+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_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 17876 bytes
SHA-256: eef8cc44f97487afa02725c3f84467b02cfd8adf581efa181d25afa93def5ef5
font_01_sfnt_off0001230f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B26 10568 bytes
SHA-256: 086fae5fe9bbef3c58bc0c5da2be494568a58613a4c3256639ea8c737885f75d

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