Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b24d455e18c60fc…

MALICIOUS

PDF

68.1 KB Created: 2021-10-01 08:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6b0a3fcf68390e5af4afe240d21ecec2 SHA-1: ff419e4d46358c46e1cded55e5ea8c31a9e3269b SHA-256: 7b24d455e18c60fceb95a4c1822ba1e8a1904edd62289317a8674516b5e279d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://huntic.ru/uplcv?utm_term=text+features+quiz+answers PDF link annotation
    • https://gobelsprofil.com/upload/files/verapijuwesa.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/pusuko.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/nujabulijuveduxegesa.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327c03aa55a---47998979032.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///2021981453377789.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/sifilofukoxama.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/pujajonozepaz.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/92005607058.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/zimavuvugozejekugi.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/digugavoz.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/toxuz.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a4547fdc4---wixurirutugetiw.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/42768655149.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/75587189188.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/mugigaxilepafesajitijufip.pdfIn PDF document text
    • http://dury114.com/userData/ebizro_board/file/vofovexibanukaxegi.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/tubomikonitudefet.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/tixito.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/tagudibozedubasilanatuxup.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75843914419.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/fuzojilanos.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109282226251960.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/71211843445.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_off0000ad6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6C 10500 bytes
SHA-256: 8a10d2fd2760d423d83a44628f480088b4a0026fad94158cb0c0a1029ac59c48
font_01_sfnt_off0000c58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58C 15044 bytes
SHA-256: 898907b556bdf1a6eb4addc88e4c71ddab67a60ece908ffae8f6a67d380f953a
font_02_sfnt_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1