Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb5768b90122da2…

MALICIOUS

PDF

86.3 KB Created: 2021-09-08 13:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 553ed8bc3eed83a3e0b2a63ce7cc429b SHA-1: 907fdc73e886d1fc6392ea49dfd4f90820f1de36 SHA-256: efb5768b90122da21a61bf9198126e3a75054a84c935e391e4dd06783b3b4d28
182 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and heuristics related to download buttons and browser installation lures suggest the document is designed to trick the user into executing a malicious payload. The embedded JavaScript likely facilitates the download and execution of a second-stage exploit or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://turskazka.ru/ckfinder/userfiles/files/65494502290.pdf In PDF document text
    • http://mrcookie.tw/upload/editor/file/032219579797.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/manetazoliju.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/balabekolufezuvub.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/zotad.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/2968671229.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/zabunokovesumelebabu.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/wipudi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9101b56d---nebediwifozajukukivozu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136121da8b97---48902441150.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/foxamogoxepufinakadukana.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210903_082E286BDF43373F.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/56004153.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/sipor.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/kusexadiwaf.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/jofebijulajomupow.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/votesuwazitoj.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/kegisefabezemuvifoj.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/91178265852.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/wojeporasifoxenexara.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/kipakolifidovenizipenos.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/34977273223.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/megegizidixigiguj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=rotation+document+pdf+en+lignePDF 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_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 10840 bytes
SHA-256: 94142a31d1b3ffd47e5dc643cf7e253b35bf39d7bf2dfb76c06c11d68acef77b
font_01_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 18396 bytes
SHA-256: aabb8b96793ce27831462de13ff81b71b273949d1bc24a1993a25e535f2cbc13
font_02_sfnt_off00013389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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