Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4b9e5f42b452a4…

MALICIOUS

PDF

77.7 KB Created: 2021-09-14 00:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93b2ebbf35f7e9017488b872107cc8c1 SHA-1: 447ec4e24211c016ad3db615fd4966bf6bad94ce SHA-256: 5d4b9e5f42b452a426b2f6cb0a4626655e823f67a7be8ade6824a2b48f39955e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on various domains. The embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://terracell.info/images/file/6054769479.pdf In PDF document text
    • http://dlevitin.ru/fck_editor_files/files/96513146445.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/sujapu.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/19487648547.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/70e857ffa4abb504bde23265e4bbdfca/wakixegarulemasavuxig.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/fenibimo.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/23371707643.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/xidozoxepanevep.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/60220005663.pdfIn PDF document text
    • http://anpharma.net/upload/files/mubakisizal.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/46554679772.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/96986577106.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/67584381541.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/danosu.pdfIn PDF document text
    • http://headrepublic.pl/images/files/35896385679.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/55840463142.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210906210317.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/5083938528.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///83332560591.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161331555a7792---repusavuluwowajunum.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090515021197.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/vizavusanonuw.pdfIn PDF document text
    • http://sjanzee.nl/file/13903108673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=jurassic+world+fallen+kingdom+watch+online+full+moviePDF 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_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 11260 bytes
SHA-256: fd21af3f8e5dd1a688ffecf11ba28f4549bfa5f09593e0953bd9e003f91f864b
font_02_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 18120 bytes
SHA-256: e0323eca8ba137c700daf96f1ffa4cab3c53e3a1c8904f07d4e3157e97929051