Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a28304bc2ac53a3…

MALICIOUS

PDF

73.5 KB Created: 2021-10-05 09:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d51939de8e21e23b2c058d87bb28eb6c SHA-1: 453f096344887312266df3edd2aa83815b9c13c2 SHA-256: 0a28304bc2ac53a3ce5d0c8fb170d5163e4d1f37ad7b7940b8a8c1960103e79a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of this document being used to redirect users to malicious sites. The ML classifier also provided a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/13163374798.pdf In PDF document text
    • https://eobliecky.sk/userfiles/file/73050236233.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/46585337095.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210906/file/53117324130.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/fetazogobonofub.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/xinulalosewogane.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/jemonavakonujojidadepe.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/mozuruwarawewok.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144860d00959---53548700503.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/44801446175.pdfIn PDF document text
    • https://hirurgija.me/files/xuxik.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/75097229498.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/vaxezutitanupiraladavimen.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/givulize.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/kilaveruzof.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/liditefesetutigodelimat.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021100215222054.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/57245716443.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/tajufajibozij.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/5839591492.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42796624757.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/kodid.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/lorelikorefiza.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/22238142558.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/bifiwakanusid.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/23843747059.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/rafilenamiwamowol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=trial+by+impartial+juryPDF 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_off0000bcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC7 10336 bytes
SHA-256: 68747e868bd3e81dddc78b86e54aaf7da1e4b61e606e86bb009ace18da9f4274
font_01_sfnt_off0000d3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 17008 bytes
SHA-256: dd637d215d6f073208b7c9dd2f66c3531671e2742d62a76f9016d6991a765ebf