Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5d4dde0e914c50…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 01:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 71e8e6744abdd7a52c65ff5ce6b1a0b6 SHA-1: a0337d3985620dc73d9cd603708654aaeced3bde SHA-256: 8a5d4dde0e914c507e0450a4b8864292de931310b7ffd1bdd53ce2614ab9ff6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant portion identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://m3hotels.com/userfiles/file/mitazawisigot.pdf In PDF document text
    • http://www.fashiongale.ro/userfiles/files/zexunumokorivulinanese.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/37690149187.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/futawubupopewow.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/nekamovetodisu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/vuvurepaxifutakolefemuz.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/webosowefek.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/cac7e2f8788d65b5fdb845c4372861a7/dizexivolidovamelibidoxav.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/37577711436.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/daperumivipevuwal.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/fonozuvarivazuxuvep.pdfIn PDF document text
    • https://music-group-store.com/upload/files/27272461165.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/fagidolukunomejiguv.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd67891590---zavavigetajofagirumib.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631303471.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/gitafogedulirovinadex.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/12751748561.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/21466320867.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/70038753358.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/nosurapavudamuvidifofudeb.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/mowofuxolegininupik.pdfIn PDF document text
    • http://sql110.com/pic/vemifubewesegoreluki.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/3135536319.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/jujibenudibezuwan.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/87720397749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=selena+en+espa%C3%B1ol+pelicula+completaPDF 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_off0000b5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F8 17892 bytes
SHA-256: d25770721ef0dc1539f779b98f9b5c2883bd85fa9a8e355d3c9b3379a41eaaa3
font_01_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 10816 bytes
SHA-256: 62669d017cd3b1752cf45150d95335f4b3ebf47064269c637acc3faae32d432f
font_02_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1