Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda181ecf05c7d7e…

MALICIOUS

PDF

61.3 KB Created: 2021-09-25 08:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 55b3e787c7bc06b334e88197b3ef529c SHA-1: bf1131ebb9c4ed2a1581ae20069c77d2c1c2fb8b SHA-256: bda181ecf05c7d7e53fecf383342740e0e6cdce956e5943106b91438fb1e32eb
124 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a likely attempt to manipulate search engine results or distribute malicious content through a network of linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5578

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 http://felixefontesadvogados.com.br/ckfinder/userfiles/files/51693863414.pdf In PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/62991717130.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/25526013698.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/dikudisobitizarorafotenol.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/97802111229.pdfIn PDF document text
    • http://mousike.it/img_ins/files/6634496058.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/58292667166.pdfIn PDF document text
    • http://yjccnc.com/upload/files/bedubomuzojifiwugu.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/tepewototujipinosadu.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/42497947523.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/88618605594.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/likuzebexagofuruzuvugu.pdfIn PDF document text
    • https://asi-filter.pl/files/file/jixikewowus.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/safatot.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/sizamemogarumekejazopa.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/dumixukajuvidukokukari.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/86280870531.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/21727547808.pdfIn PDF document text
    • http://cbstav.cz/file/mokugi.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/zonusekivukixifokukonufaz.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/gunolidatewuralebu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6b9e68d8bf22f53cefcaa8e4ad5a7cf5/89549265942.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/firafovu.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/wuzetibanajut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+hard+reset+moto+g+playPDF link annotation
    • 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_off0000be69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 10832 bytes
SHA-256: 0611d38bd87b093db022e395456239b5ee343f652eb2bf406c0820569f28c5fe