Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ae3b0fcb7581461…

MALICIOUS

PDF

62.5 KB Created: 2021-09-20 20:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 557b4cd65727d32addde09d9b5f541eb SHA-1: 53e111bbfc9fe59c838a17245385fcfad66d1d06 SHA-256: 2ae3b0fcb7581461533927704e623890fd7a54da3e4af430bed15bd4766a47a4
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristic firings indicate that this PDF is part of a link farm designed to redirect users to potentially malicious sites, with one specific URL suggesting a lure for SMS receipt confirmation on Android. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5247

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=sms+receipt+confirmation+android PDF link annotation
    • http://skiflogistics.ru/userfiles/file/siwibanavusunilagegojudof.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/5667201979.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/wozidojitulawufewur.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/rapesakexeratu.pdfIn PDF document text
    • https://quizai.com/uploads/files/vosivokodagowu.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/wikamapobaxolilem.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/21421587560.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6cb61d4c98dc65c3f1dd86d28953fa8b/5548815689.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/zavesuzixejekulapexezo.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/kipirukilobusodasisipid.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210905105448.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/4096035648.pdfIn PDF document text
    • https://fishboat.hr/files/tanudan.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/nutamoxelizixaju.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/95623286589.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/516263704.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/famusametefasifuvoxu.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/89016499381.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/fomapuluvegekoxow.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/11867435208.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021932223261456.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/fafakokokagalewopevize.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/mudipefokapabofumamumew.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/sekigobivole.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/gejuvatepazise.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/guvubidikevevoserusubeton.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/92820171384.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 10812 bytes
SHA-256: cf98554662872cb980db3bc81ddcaf8e03f545599ec68bd3348401b09ee3112a

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