Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4a8d50944fa890…

MALICIOUS

PDF

78.9 KB Created: 2021-09-11 12:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b234737deb07728c8dc6a44656e756be SHA-1: 6ad5abb0f9110d79d67da3d282734415ec013f29 SHA-256: db4a8d50944fa890cdb382a1ed097a94cf1aaa436e383fdf9db5f92e6e3a0a8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs and the overall structure suggest an attempt to redirect users to potentially harmful content or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://vandervalk.reviews/app/webroot/files/userfiles/files/gesibodopedabelukidefime.pdf In PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/10042097873.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/97542637562.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/16125378099.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/95467998001.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/tavoludus.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/kakot.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210911_680A070EF7E556E5.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109010238373292.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/58780635284.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/pitelu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b349c59b16---47394417999.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/91592611919.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/tamebasulafafiwabizoteb.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/waruguj.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/zatusuxabu.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/2717062445.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/58184934334.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/muzenilovo.pdfIn PDF document text
    • http://web5gstore.com/Files/files/bikezuduvositadufanit.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/sufikur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=backstab+apk+dataPDF 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_off0000cfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD2 10196 bytes
SHA-256: 4a91123b63570255108311277b74496a47c9d44daae64581b449b47879de3593
font_01_sfnt_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 18164 bytes
SHA-256: 8b57def543f188caef731f09338240d509dac3da8726be584ee3ecbc4f16f622
font_02_sfnt_off000115ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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