Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3363bfbe39b029…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 02:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79e173537c4c4882bc80555f3b640f81 SHA-1: 1d655f346fae7446e241de97036e8c038f79680e SHA-256: 4f3363bfbe39b029d7a92cb017a514679e37a0ee04bb36545fcb5bfd3ac21865
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded URI that redirects to a URL designed to trick users into downloading software. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://coretry.ru/uplcv?utm_term=download+google+play+pc+windows+7 PDF link annotation
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/79c08293193f2af070ad2998233325ce/34427830044.pdfIn PDF document text
    • http://www.bash.cl/media/file/88156616291.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/sawadimunetan.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/rumawudejovu.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xavidudeworum.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/40974044491.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/fowafobufidefosod.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/vuroseko.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/lopisetetuged.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/witavi.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/gozipet.pdfIn PDF document text
    • http://indemo.pl/Image/files/40109739697.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210904001558.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/lobodujumosonovexonemiw.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b80880965e---62833030982.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/polutakowebimogubijap.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/68516665245.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/jixojezom.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/dewib.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/wukirofoxosora.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/87625066074.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/narubiletikuvororovakoji.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/xedowupum.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_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 16852 bytes
SHA-256: 41a6dd1fbbd599e73000c6e94f4a0953a7f88e4d7f3baf89dd5bbc861c1657bb
font_01_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 10740 bytes
SHA-256: 23b6d1263a90ae6521211756c574dd4346fb1dacaaa89e96a07f204451e78506
font_02_sfnt_off00011964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.