Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ea8df4e7f98083…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 09:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d8392f20b5eea88d23c0e33bb1c032bf SHA-1: 36dee332c655eefc564ba14251630f9819f8dc3f SHA-256: 25ea8df4e7f98083f9a0928c4e8ee7947bbae4a91de125576606abff67dfc749
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URIs pointing to external websites, many of which are hosted on disposable domains or IP addresses, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=crossfire+offline+apk+2020+download PDF link annotation
    • http://bibliotekaludwin.pl/img/upload/files/penekutolowarisudatidukux.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/15820804959.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/tujuxavolutatun.pdfPDF link annotation
    • http://f1-rennsimulatoren.de/userfiles/file/xaziberurikeno.pdfIn PDF document text
    • https://thehouseproduction.net/file/xibenuwuwilanab.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210904152714_72045357.pdfIn PDF document text
    • http://pedraferro.com/files/files/19080122130.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/pimekajudedajuperafug.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/4181317220.pdfIn PDF document text
    • http://someteme.com/archivos/_20210902011706.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-1/20210901050815672553.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/mujofepep.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/pinabexuwidilodivubos.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/43176848017.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac876528cd---nowisip.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161398ca4351ce---gidanotos.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/wajorikajapubel.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210909_B500B6929B58229E.pdfIn PDF document text
    • https://anakmeong.com/contents/files/fenulijop.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gukobupitamudifowotu.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/mimabilojukudegiforuzo.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/pideveka.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/55995591039.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/kakeruvozemov.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_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 10844 bytes
SHA-256: 26acb6c55ec8f609f09119b3fed4b4d99c2afacf77016f447ff0d4721807a0d2
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 18552 bytes
SHA-256: 4bd8edfa038d3b6a94fd1514e913b92fa1b650af0456307b98f41588d09169fb
font_02_sfnt_off00011fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1