Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8b3554d5af7d1f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 09:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67dd0189b1372fa8676b1f33e2c66cbf SHA-1: d9213aa804030af1a1c3af28ae8bcb49bab758e3 SHA-256: ba8b3554d5af7d1f424b73af7dc8a091d251e4459fa7bf4434529b76946a4b46
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is used to redirect users through multiple domains, likely to obscure the final malicious destination or to distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://proartgaleria.hu/files/files/39824110803.pdf In PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/mofinivakaguzosono.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/juweruvivoxiromurar.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f09bba51ee27dfb1fabab5b563d3b9ae/pisus.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/jewuzirujozazuwipi.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/givumulamuwuloraj.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/51990190142.pdfIn PDF document text
    • http://ijfbn.com/editor_up/85959429624.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/zuvovizubuguwamimuzon.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/kukozewegozagedijemot.pdfIn PDF document text
    • http://lachina.cn/upload/file/4971350689.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/rodovuxipepuwaxoruda.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/siwezadisewixutusamesuse.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109121016147290.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/sozaw.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/zisetix.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/sulet.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/vibarupudokikawugajip.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/72737559417.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/78148763991.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/99662334828.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/44441504676.pdfIn PDF document text
    • http://medrea.ru/upload/files/mipiweba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=line+rider+apkPDF 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_off0000c228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC228 10000 bytes
SHA-256: a7f6307c6f903d22cecadafef1c9103c61aac5be1aeaa6f887e97a343fa09829
font_01_sfnt_off0000d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 17628 bytes
SHA-256: 28507bafdeae325514d2d4fb32cfc205a6e2611a193020a16d25bd406fb91a81
font_02_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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