Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f0c6b2db32df2e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 05:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7bf296d513aa473e524d552b20b6b66 SHA-1: 63e338a77e5382c5e7147a3375b25ced38d0c632 SHA-256: 21f0c6b2db32df2e70a6ec9caa00076971504038fcb81c3d2fedbc5e568a698a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a critical ClamAV detection and a high ML score indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host numerous links, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=app+anime+smart+tv PDF link annotation
    • http://isotech.si/uporabnik/file/ramukakej.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/lawekesaxuwasaxejazukivi.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/wusiwifosesoni.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/1285786839.pdfIn PDF document text
    • http://viorina-deko.com/images/file/26565086558.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/48657521848.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/61087712657.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/valepemopegavonabinode.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/gikebexeju.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/xezejurakakabimunope.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/52102055590.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/tunerepevu.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/nemotatiwefosuxi.pdfIn PDF document text
    • http://dezis.ru/uploads/files/tejilezuropazigujopojot.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/81034362711.pdfIn PDF document text
    • http://arsvet.ru/img/upload/18798219228.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/gaxujig.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/wojubusapo.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/4004367425.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210912212230_1165422255.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/eomm3lvq3pj094e0cu2dhmmp35/46761463663.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/4585657919.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F2 16416 bytes
SHA-256: 0a7c40006fc27d51153b21d6a48ea79a8c7f146cc8b15030b343ea684e52a4c8
font_01_sfnt_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 10292 bytes
SHA-256: 922f96946f2983854fde8840e1a7ba40cb7a4707261d78b299aed9401779cb10
font_02_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 16396 bytes
SHA-256: 6c55bc1353e98dfd25beca0163b01599b0d5598510c7bffdeeb41adec9708375
font_03_sfnt_off00011a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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