Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b9c412269263c6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 11:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9fc80716c17df1d492a7c8d7fc224790 SHA-1: 9706a89cec0a85be30f403fb7213295b0c047e60 SHA-256: d0b9c412269263c6795273954193452d0a058bfb0c30036f2f43d4467b1f3053
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to unknown domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on disposable hosting, suggesting a scheme to distribute or redirect users. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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 https://radekslodkiewicz.pl/files/file/lokijevut.pdf In PDF document text
    • http://020tzs.com/baige/images/userfiles/file/94971216601.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/68906376041.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/kogutumum.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/daginofeka.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/gexolujom.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/76204792191.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/lasenopajawituteseloni.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///nidamibanenaw.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/89990118042.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/fapaguvudapikatupabem.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/85205101083.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/fimupasadifefulebevisefe.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///14625085701.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109011642352074.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/lutogaja.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/37393335331.pdfIn PDF document text
    • https://ratosatu.com/contents/files/fularofez.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/xepewonawulobatisanogiliz.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/59265580605.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/jovemex.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67e2db543---69158543868.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/314166823.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/zimonido.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/91536354248.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/41203441558.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/bivimalurebamifudeximuviw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+install+gse+on+firestickPDF 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_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 16984 bytes
SHA-256: 2a98c733e54f19a04f51dbde2eebae04a8371c92c866f5574d1812c4028d70c6
font_01_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 10680 bytes
SHA-256: 2f2e33b548d2b3e8e001eb074b9af19a75a2d4777b2b93ee26d25b85c7fb8ee2
font_02_sfnt_off00011bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1