Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6997eb32aff3577…

MALICIOUS

PDF

81.2 KB Created: 2021-10-11 12:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 94391a766d89a2959523f721780a2e1c SHA-1: f7c2c1a63eac1797d0b16d9d612ef7f9a336cf8f SHA-256: e6997eb32aff357792abdba5109c64f41beb8b0d88aaf8d6568faea903537613
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. The PDF contains numerous embedded URLs that point to link farms hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

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 https://unicon-msk.ru/data/files/pibafuzovu.pdf In PDF document text
    • http://kondicionery-bronnitsy.ru/upload_picture/file/xitutupagijevomaz.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/52918361394.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/jemuvati.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/kaporifibakijabogutamafo.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/rokulunubizodemowuneguv.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xivipaxubanurufobugas.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/mituwizufesuvapelono.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/nezuninego.pdfIn PDF document text
    • http://coolscape.info/images/files/13479195342.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/25383236558.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/58613854904.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/54195064844.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/75068790756.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/wariromin.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/64282514881.pdfIn PDF document text
    • https://norservis.com/files/files/fekegi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16158b6c28a445---jadivojiravim.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/pesererizibozakit.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/73634627411.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/bakenipaka.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/25490155781.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/fezedojubizerem.pdfIn PDF document text
    • https://4u70t3k0-4tl.com/contents/files/99911079753.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/896FEnmJZlk/uplcv?utm_term=unsecured+creditors+committeePDF 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_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 18644 bytes
SHA-256: e0db0fba67dca82bc553ed864449d10945c4fa6cfcff11ebdc71db30f74e68f8
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 10432 bytes
SHA-256: 698e3dec9169ec057d34d3e83534b2b609f725f975c563d3a5381511855811f9