Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6536d233fd7ff03…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 14:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bac57fe31344060dd25cb75c17583318 SHA-1: 743338b6d16e9f9bc772dfc11b099d9459c3e858 SHA-256: e6536d233fd7ff031e82f2de23dceda00d4c75af76d8759eaac9619e29ebdf59
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to PDF files on various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://adoz.cz/ckfinder/userfiles/files/niforekikifa.pdf In PDF document text
    • http://azco.friend-match.com/upload/files/zolosaxefukisoxobolulixo.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/63410416508.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/patulo.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/pubokigalujaliwi.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/dutevibotojotefakijimed.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/ratoxenikukuvimelos.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/daxad.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/razonadodefulutom.pdfIn PDF document text
    • http://sbkf.org/files/files/mubagurerurugewebevusaga.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/17002688618.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/360d9226ec0d928c6d68a12afbe9afb6/xipagenokigejudere.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/38578527683.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/woperubojifiragaboruj.pdfIn PDF document text
    • http://szjg.hu/images/file/40980155636.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/lunibidoxubu.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420dd15ece7---nivalenifavetoziwikik.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/27289555975.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1632723339.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/293208_vukuxasosatop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+iphone+fps+games+2020PDF 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_off0000af71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF71 10952 bytes
SHA-256: cd979c8ce8a8be200c221c80f44a7bcb1d89b7d663003682f858f316921a3194
font_01_sfnt_off0000c8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 18444 bytes
SHA-256: 574a493e6ea34414b9441b4f9fd041df6c435d44153464015d7f2a876a3daf5c

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