Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3a4f0f2faea3f0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 13:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 386f3b6451363506a0ecb1377fb46b18 SHA-1: c24a1d2f85ac00d1660e8efaa33d986451af21eb SHA-256: 2a3a4f0f2faea3f0423cf5aad2004286869fd35a85fc88da9ab46fd77eaa476f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, suggesting a phishing or SEO poisoning campaign. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://delaneyllc.com/ckfinder/userfiles/files/13556034904.pdf In PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/fusevidigofa.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210914103223130646.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/93183272134.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/tinedekevemaveguwipubev.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/vizokuxemozi.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wajovuroroxidu.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/93726128110.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/34528376368.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631006594.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/kumitejunifukula.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/tubutajigemorefupizoxuwa.pdfIn PDF document text
    • http://rentaruedas.com/files/others/151746598.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/nivufitorapitob.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/60786620473.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/wosovotusesixad.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/78219098956.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/gisaxevudefa.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdce595d8b---87539481944.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/44507509116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bl+blends+word+listPDF 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_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 18108 bytes
SHA-256: 9aad460a600f4d3d68d227fa2f3486ad5d6a7ed1c47d98361d3aa6762b3672fc
font_01_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 10360 bytes
SHA-256: 0ed8d6f212330935bf32ff9e6ed50aaa8c13daf81182570be3849a0540bab61b
font_02_sfnt_off0001265c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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