Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb0b3eebaef1b2b…

MALICIOUS

PDF

66.4 KB Created: 2021-09-16 19:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be882a9a51ab61918070a56c6156f341 SHA-1: d8875a365de527a93f7200ae6360d7696b77ee2c SHA-256: dcb0b3eebaef1b2b3dadd7a1af2d4f935e48595aeabd9781d0f05c671c2a8c60
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF containing embedded JavaScript and numerous links to external websites, many of which are algorithmically generated and hosted on disposable domains. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a malicious intent to redirect users to potentially harmful content. The embedded JavaScript likely facilitates the exploitation of vulnerabilities or further malicious actions upon visiting these links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://irlanc.ru/uplcv?utm_term=one+piece+kissanime+sub PDF link annotation
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/46883505141.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/30003524247.pdfIn PDF document text
    • https://bnovum.hu/downloads/32737154686.pdfIn PDF document text
    • https://alpinashop.bg/files/xozugogenerom.pdfIn PDF document text
    • http://novichiha.ru/pic/file/57251706520.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/gisanu.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/53510985808.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/9306916432.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/37139165776.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/jiturawo.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/46690315811.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/tavesan.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/xokugiladipudoteza.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/82044262149.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16135daa32a9c0---32433329369.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/43258748116.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/40661777524.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/nezifubifabuvozawo.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/vutejijegoguvexosena.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/r4sfeefms4oqjrjteiavnalgls/92684539600.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/2875300514.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/sewivopitudukifuruku.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/vevefujetadolixezupaz.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/97432154256.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A8 15440 bytes
SHA-256: 10a06d3ec37379c9cfcc902cea0acd86d27cdca8f8d239cf475712a9b79b7977
font_01_sfnt_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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