Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a390503559f317a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 14:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 524916adcea510a948830f4f742f4bb1 SHA-1: a0680e9f59cfe9210e57da13559c27a225fe1c5b SHA-256: 7a390503559f317a098f6c638ced6b3275ff72bd8047eb0aae76d23e5f5ed8aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of many external URIs and the link farm structure implies an attempt to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://csc-021.com/userfiles/file/20210918185744_m1ev6w.pdf In PDF document text
    • http://www.urbanwaterways.info/files/jatopozanavonegu.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/vifinimivinezoloj.pdfIn PDF document text
    • https://777mto.info/contents/files/71701584264.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/60535666813.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/melexukuxulowidevikenav.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/venipu.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/davorusilaj.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/nosetufutuvoguz.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f2343a9ccd43d2a292587233692a3d5/misefuvetekefowibujoz.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/jojasinawomax.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/82039729532.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/wuxivepik.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/kabikivefiwipiverefoxejot.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/jelozuzurepivevarib.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/7032115542.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/dagugonupod.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe5bcb4a4e---sixogi.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/79576089493.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/57457818942.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109130854073954.pdfIn PDF document text
    • http://yepuco.com/uploads/files/gitukeweluwunadis.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/19513978909.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/nirosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=diamond+gaming+apk+pubg+tournamentPDF 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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 10852 bytes
SHA-256: 57de3098f4ea6c68ec3deb7cdd2de8eacf3bcc3188d009aae250fde440f64d0d
font_01_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 17648 bytes
SHA-256: 65ea64578d36595e0bca3ec8a96f841e0df6d145b674ee16313c8ecd7754170f
font_02_sfnt_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1