Malicious PDF — malware analysis report

Static analysis result for SHA-256 6972ba986b44d159…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 20:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2e4c6bdb5bf38b31347336f91d31302 SHA-1: 297b41005db62ac7b1d03a42ea4ab44cbe5387e1 SHA-256: 6972ba986b44d15906993b0be7a0e5c55df59a9ddd770109fe03d2cd1c25e62a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 https://synerhu.ru/uplcv?utm_term=windows+8.1+pro+generic+key PDF link annotation
    • http://otpetye.com/images/shared/file/37787305457.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/14157849331.pdfIn PDF document text
    • http://pasted-radio.de/web/files/54690044281.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/nivuranuwipega.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/resapinixamav.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/93549485146.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/11127129449.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3edb1e83---61200633805.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/sefivan.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/kanafibu.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/munijubajiselel.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219102357117549.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/najesul.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/21767702929.pdfIn PDF document text
    • http://npas.ru/pic/file/fatawubutemixisufa.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/16831393505.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/lazukemipewexiden.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/84262973755.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/43667102325.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/kukatexil.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/79138744062.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/b9090f31ae504bf76770e3379ab94e82/vejidanesilona.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/65932657662.pdfIn PDF document text
    • https://invest.pl/userfiles/file/movudol.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/52382312123.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/murokolidixowid.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/sakogitib.pdfIn PDF document text
    • 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_off0000b25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6F 15704 bytes
SHA-256: 528cfde9bafd879f682cfa5f3999cd95360e2c27ef72515d61adf5548bed5fb8
font_02_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 10992 bytes
SHA-256: 49d4e46485cc6e4ea55ff2ab67caa3fab59cc2b4487e60c4c672b5bdc6dc71b7