Malicious PDF — malware analysis report

Static analysis result for SHA-256 63220b860558bf57…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 15:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f21fe9764dc46b6321abade8254f3938 SHA-1: 0f4285f4262f7e48508bf031ea9715bbac557694 SHA-256: 63220b860558bf5789db5a7c11ada5c5132c19e63f7b2e6f8aa5a5205fbee321
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of malicious intent, possibly for phishing or distributing further malware. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chongtham68.com/app/webroot/uploads/files/84250965519.pdf In PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109040000130893.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/damaxaduvujikoximit.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d71c4e8e---79089807910.pdfIn PDF document text
    • https://wittnebel.dk/file/sunoxom.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/63906783452.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/52579292197.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/duvor.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210911094340.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/ludukoxukesisedolowupe.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/28984211782.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140251598693---22780154693.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/39673404842.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/86634152847.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/takagoruxonukitomege.pdfIn PDF document text
    • http://mopron.ru/upload/files/87645392376.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/ruwaxezajozalipenur.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/lazelevisavepurojerek.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/duzekegulop.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/bajevifijogepijebipefu.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/77392344238.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pegilelodasidizut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=evocreo+apk+latest+versionPDF 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_off0000cba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 17896 bytes
SHA-256: 162ae994f4958dd3e657df6b6d55ddb9074690e66a93a48081f55eccd6f02b79
font_01_sfnt_off0000fa7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 10508 bytes
SHA-256: bb0eb0888a443222c1efc7957235d97c4a704a499ad5ab63b3f201b06debe34a

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