Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b252212144fe26…

MALICIOUS

PDF

75.4 KB Created: 2021-09-20 11:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 481f58d00565d6cf511bd6f1134a164f SHA-1: b87389318b9d759c0d6040f827ef1a1238fa774b SHA-256: 21b252212144fe26ba9eb99b9fef91941a8bac5f60f153b674bac3827a4eb73b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the document suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=new+super+mario+bros+u+cemu+download PDF link annotation
    • http://autofactory-jin.com/js/upload/files/31032545863.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/ruzogidonobitofifokevo.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/66649836657.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/nagosibosemafe.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/zukemixomesaw.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/foxawexolo.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/pujojin.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/nidomegitijifemufeji.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/lawutupusumi.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/xofefedax.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/19137673813.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/zomowuzezetivesivunikugal.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337973d4636---52340249457.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/jetus.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/dojifizimi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/722bf21034519cd154d8f74b412d01dc/59926205819.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/16861267688.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/56848465885.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/segovetemopotugikodixovu.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/70433202387.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/mamarusul.pdfIn PDF document text
    • http://atomleasing.ru/media/File/golabosenapowube.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/11775478564.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/5229571456.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/bitazefagugodidaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC132 10880 bytes
SHA-256: 73c6e98b4b7d3b9c57249da4117571b2891ea19e6e6a4ddd9e15a6b5d7541ca6
font_01_sfnt_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 17504 bytes
SHA-256: 266ceaeb74559be6fe7917d56fe28eb8757f1347af9c80c505217575cadcbc80
font_02_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1