Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8a4dc1d9f1bcf3…

MALICIOUS

PDF

78.7 KB Created: 2021-10-10 08:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d103c18c60c4e71916e53bd87bd3e403 SHA-1: 1160f75f9bd5f8221a4255dd02bddb48713f1b5b SHA-256: bb8a4dc1d9f1bcf306dcfdad35bd959161c03a07bf8a8c97f00f374cb8a9aa28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous links to various domains, indicating it functions as a link farm. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern, suggesting the intent is to direct users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://12shio1.com/contents/files/46513892724.pdf In PDF document text
    • http://floralojistik.com/userfiles/file/nabejumelokol.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/20673318834.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/lesakojelegojolubebegan.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/dokudos.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/22001836839.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/budewuxafofasetonufi.pdfIn PDF document text
    • http://mailcontact.jp/uploads/files/vekarasozutaziroliv.pdfIn PDF document text
    • http://net-work.cz/data/file/rijatonowinegelizotu.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/bulotig.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/63459324116.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/3792740683.pdfIn PDF document text
    • https://htchninc.com/d/files/golikesinikokaba.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/15560073123.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/93a2efbb3bc3f914311c6fa72160b8df/vakulex.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/popodupuguvomot.pdfIn PDF document text
    • https://12tiga.com/contents/files/kojezuzewirun.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/80267068637.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/jufesijigu.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/6227050066.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/3311287800.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/tutosebix.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/gerenixuwawe.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/lukaliduvepugojunupa.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/lutidun.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/54053469264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=advances+in+fruit+processing+technologies+pdfPDF 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_off0000cb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 11048 bytes
SHA-256: 1b6f614a9a598225e635da0316734a549e5f4fa2f6e5f1efff028d7211bdecc5
font_02_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 19364 bytes
SHA-256: 28cf189f491301ff2caca78c09639f7eb0d61e43e9d6d1e51a5e3115e47745c0