Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c30f08e37a89b0…

MALICIOUS

PDF

69.7 KB Created: 2021-09-12 21:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 672c7096eae96ee365c664f66eb8a644 SHA-1: 03ff34c67bd937dd19eab36afe8926ca2d6f19b8 SHA-256: 36c30f08e37a89b07ce156e31ade1edc963693be844ba285cf7632580688c97b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains numerous external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or scam attempt. The embedded URLs are likely used to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=dead+target+hack+app PDF link annotation
    • https://caribemed.com/userfiles/file/borixamisino.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3e3546f8---79556542996.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/26042647489.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/fokobitorobovewid.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109122227432743.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/36290709858.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/3327085557.pdfIn PDF document text
    • http://budka39.ru/files/xatoki.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/36072639065.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/varapunekevopifup.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/pivutufijinale.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/foligalepabise.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bf314765---93484837671.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/doxodasogefasovasazuje.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/kevemubenifavakowunilaliv.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/39824110803.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/dafekapuzoku.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/bomatobedetedabu.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/62748484628.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/pikaze.pdfIn PDF document text
    • http://ud2-140.com/files/49875792416.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/89963434605.pdfIn PDF document text
    • http://delve-cr.com/uploads/55813360330.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/tutifez.pdfIn PDF document text
    • http://klhl.com/userfiles/file/sajixut.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_off0000b12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 16268 bytes
SHA-256: 9bb3e23a0fc63702aebdeafd2dbeaebfecc32e8e024365021c75accad366a011
font_02_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 10356 bytes
SHA-256: 55736d69452e8bc3fea2e1a5e729c019f69220ea7f74ffc832c8e053a3d3c0a2

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