Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad72ba4006f7ba8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 12:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 443efa8aa2741ca268bf06fd0bc03971 SHA-1: 2e86b8320ac56e7cc7dc21291b22ebb774ceec4b SHA-256: 4ad72ba4006f7ba84602c41ed7246b32711682914a02ef4f705b87d1da11f8aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the phishing pretext by indicating a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=binding+of+isaac+rebirth+tarot+cards PDF link annotation
    • http://imreelectric.sk/uploads/file/muwefetoxijeg.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/87707565129.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/fusoji.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/kupobajikevawenikabilaf.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/vozararokufi.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/viranog.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/wokarebulojewu.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-10-08-10-36-39.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/18515481515.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/tunabuluxoxagawibo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396c94a1e0a---76340467901.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/16637531459.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/50097604045.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/60812828788.pdfIn PDF document text
    • http://ellev.fr/upload/files/98959551276.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/guzizezisugi.pdfIn PDF document text
    • http://kmsenior.org/file/files/65912110690.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/46726033641.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/15264370042.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/vogivik.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f323c9eab6---43786381135.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/65939372265.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/86223577686.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/84804657273.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/1837394805.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_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 16844 bytes
SHA-256: 76d957aaf57cda8f64157c046fafb933c21bbc07c77c6151d6e6533e8d9b063b
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 10900 bytes
SHA-256: 126a3c32d23d206beb7bc584aebd59324beba918422e01cec00c35dc53df42d6