Malicious PDF — malware analysis report

Static analysis result for SHA-256 907a7e2d0a77132c…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 00:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3cef9aefeb3f9327efed572f0c482e6 SHA-1: 4b6a68eef8368294fd1f0658f7feb610a70f52e3 SHA-256: 907a7e2d0a77132ce554d09e694466a19ff3a24eec6bc65e1e62d07751fd1a0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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.
  • 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 http://stellar-toys.com/ckfinder/userfiles/files/8222086999.pdf In PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/kuzeravimaziwo.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109080705305416.pdfIn PDF document text
    • https://ptogel2.com/contents/files/59662311973.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/56063097141.pdfIn PDF document text
    • https://olterus.org/contents/files/mawemipirud.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/rusorukajuxesafo.pdfIn PDF document text
    • https://isleo.com/i_photos/file/62200661447.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/vunofanexuwelewanotalubag.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210902_FD2E28B165D780AF.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/tutibibakeboliredawirorox.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/zawisafowivugut.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/90454542264.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31613274728.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/petanokixorusemobu.pdfIn PDF document text
    • https://webmenuplus.com/images/file/veretusuduzotojomasuzuzor.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/febemizazolipimedupi.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/dukubakadivebosapati.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/sonowesifizibafef.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/luwojowav.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/11530754948.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/66231945061.pdfIn PDF document text
    • https://windsbs.biz/files/file/40632801758.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c4b57200---tevarofog.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/46440826377.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/36622938380.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613901fa0e5cf---52250925019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=8+trillion+in+scientific+notationPDF 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_off0000cb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB71 10440 bytes
SHA-256: e9efec7222e71736d74135800aa74002f2f068995b74fd7f5b876dbed91b171a
font_01_sfnt_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 15484 bytes
SHA-256: cbd765de8d5dd866c3199dae46a303bd73d2c2875eafda5263be5402c2dfe2be
font_02_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1