Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a107e8439e3c690…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 18:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ecabb1b45c3a8c13e9b1501e674742a SHA-1: b19df8a086a94c08d96192502dfbbd3ae034840d SHA-256: 6a107e8439e3c6901dc23e2f0ad8313165b9665ccde31c6f8b0a35aa7f4aff09
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, likely intended to lure users into clicking through to malicious sites. The presence of 'utm_term_redirector=True' and the structure of the URLs suggest a phishing or redirection scheme.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://avatars.ru/userfiles/file/diniribexuwebukesoner.pdf In PDF document text
    • http://fine-trading-knotwork.com/uploads/media/63114161380.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zukapiwonikopajozimova.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/17360268759.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/xivifazubuzamezawaz.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/42307242992.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/dilagitopebew.pdfIn PDF document text
    • https://ancoraeducacion.com/images/rumorumomimetu.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/nomezonogapaz.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/tuduzawutukanukawokoxeku.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/balojixapifegusolarizax.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/30953880994.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/pulikinufoxenovusa.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/bodiripewaz.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133209887d64---resivazafefojexusexomiw.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7730ed076a583b0de3c633db526d2c19/gogeg.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/62808914232.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/69071035218.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/fawavog.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/ravikaz.pdfIn PDF document text
    • http://ccadl.com/files/20210902093043.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bifodegur.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/75130439260.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/xeleberetelaguwe.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/fufokuwovejuvefadomutol.pdfIn PDF document text
    • https://ispartapIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ver+contactos+bloqueados+whatsapp+androidPDF 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_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 17892 bytes
SHA-256: 12a3e8798868e5fac1b1ee13ecf5a82b883244b48e26aac075786eb856779db8
font_01_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 11052 bytes
SHA-256: 645d67cc42a65c885ba75217a85a3839b23fabbd7de412e97b3a13030fee9761

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