Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4e2043fea8d7d7…

MALICIOUS

PDF

78.4 KB Created: 2021-09-08 16:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 969184e5229e25872f98e44f5bfede31 SHA-1: 9b5ca2ae5632c6cc799b95806f66109a3a159bb8 SHA-256: ff4e2043fea8d7d7093611154cf833c62054d0c368809b46b9aaa15c6577f1f8
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 0.9911

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://philabc.ru/uplcv?utm_term=secondary+immunodeficiency+pdf PDF link annotation
    • http://agriturismocorteerbatici.it/userfiles/files/sujezava.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/74873306836.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/tirizopagefepesiluro.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/64804901134.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109060828024639.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/45044545767.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/45946097933.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/jekutatukuvosexis.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021930156.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/46704871026.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/rapizadowofonemidow.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/lotevilurowitagir.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/kefigubufukusapexifutej.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/39974273544.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/dowadixakodap.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/2599678281.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/tigejilajojizopif.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/lonizikulizudobofamalur.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/zeladireregir.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/dejedakupi.pdfIn PDF document text
    • http://csp.hu/editor_up/tutipudekekovo.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/widomulipa.pdfIn PDF document text
    • https://digireg.at/upload/26699832202.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/pesowof.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090502035470554.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/1140525992.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/jusujimoxumupowupolejusor.pdfIn PDF document text
    • 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_off0000cdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 10760 bytes
SHA-256: 8bf4e7a6fda8d32b107c43380baab7c3e84192745caf1c5b4b6229390f6fb2dd
font_02_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 17520 bytes
SHA-256: 79416238686fa1dbcb01035a6c48b974ec6f734473976ff6d012d085ab6fb012