Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf635d5705dcdf1…

MALICIOUS

PDF

59.5 KB Created: 2021-10-13 08:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dd86e539a5d622e7483929929908d41e SHA-1: 9cb4a0f110d97d678efd04e86773a5790ca4a7cd SHA-256: 9cf635d5705dcdf1088d07a1d26d234eafeb4f590a34dd787dcfeb94394895b5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm intended to obscure the final malicious destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5382

Heuristics 4

  • 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.
  • 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://eatorhours.org/e-bussiness/fckimages/file/89018017492.pdf In PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/nufikirugezuxexorobazoro.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/batugivabuwogobutowa.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/74444198083.pdfIn PDF document text
    • https://digireg.se/upload/tujomujenuvixokegefifoz.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/korife.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/sozafoluris.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/wemutejarogawifixavaxome.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/nosixozejomuladusadel.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/271940695.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/begefezufulixogeverebosu.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/repobotajerejebaj.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/64295932359.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/27220067258.pdfIn PDF document text
    • https://cape-electronics.com/media/file/27992225187.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/37204540795.pdfIn PDF document text
    • https://davnosti.ru/upload/43797346211.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/jabikefijuzulupeval.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/xodinawewuk.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/kejozidijutekadedemut.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/fabavusefafajezafupezupi.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/warakufas.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/kejanoko.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/46094649887.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/84978045775.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/32097658374.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/4dZi1sgP-vI/uplcv?utm_term=atlanta+research+and+education+foundationPDF link annotation
    • 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_off0000ba98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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