Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a3f7d6e3b1cfe2…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 00:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 184bc9228d1d754e0ec7225fdb7897e0 SHA-1: ed7cae7c1050e8ed8b755e5e5a6d78dd1233b165 SHA-256: c9a3f7d6e3b1cfe213604fa2a611d27801de282a7c262ae53154ea7581f4455d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be disposable or low-reputation. This suggests an attempt to distribute malicious content or conduct phishing operations through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://adamant54.ru/userfiles/files/sulisutuvikunenaxun.pdf In PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/2901202830.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/javerasejiwixelumovonorol.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/rutigosedupelopozada.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/tomoxexokelasoninu.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/85151448737.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/vipivakomemumijoxuvem.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/noganor.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/tubapowenebaziremot.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/6677026036.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/31091717192.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a4f58c9c---23111839323.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/fubevujuxojaja.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/talariwelega.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6ac98ecd5---petanizeziwuz.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/jevuz.pdfIn PDF document text
    • https://olterus.com/contents/files/81976390938.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/24965309320.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/40344179879.pdfIn PDF document text
    • http://peoplefoster.com/pliki/60965183364.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/92035697666.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/39677810941.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/josovazulobozuwu.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/tajurexuvijurureterupobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=nfc+tuzsa+apkPDF 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_off0000ba1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1A 10108 bytes
SHA-256: 0db9d708f217c267aac06045deeefd0d7bb83b7aa87d406986eb7a3ebe625735
font_01_sfnt_off0000d0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E1 16656 bytes
SHA-256: ae21d4ff951897047e5911ecc7522a2704af303120e218dc34590f2198cff0b7
font_02_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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