Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22ace4f836fe1fc…

MALICIOUS

PDF

91.3 KB Created: 2021-10-04 21:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ecfeaf2a6a52a1cf7f7609d14d51750 SHA-1: 6302b05deb2e2754c800d79c6f81b038c73c4ce4 SHA-256: b22ace4f836fe1fcd8cd38cede6a4bfa024733d577cc42628bc8ed809ed4da20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the classification as Pdf.Phishing.Trojan strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://inwebjor.ru/uplcv?utm_term=best+war+base+for+th10 PDF link annotation
    • https://er-cardiff.com/eurostyl/photos/file/topubavuxopivejigibo.pdfIn PDF document text
    • http://climtech.com/files/files/benibopixukupifuweninebe.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/motozuloluganewixur.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/aba20f035ac1b191031f117a502fc36e/13612546805.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210902122706.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ubpcmst6kiq4u10a24lgfad5de/68526958814.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210904131252566394.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/xepotujajapafisuw.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/kugabuzipajegogutigofevim.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/dilogirakiwe.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/62130841669.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/gabideluteguzanibepu.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/dokinitavalodazuvo.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/xilodogemebe.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/95863582334.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/durixesajevidelasidoboruw.pdfIn PDF document text
    • https://veriniams.lt/userfiles/file/82544154952.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/3617218167.pdfIn PDF document text
    • https://foulardfotografando.it/file/20515354058.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/sodepawojopisaxebojep.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/fopujesoxajideganovezi.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/20103461336.pdfIn PDF document text
    • http://sartor.ru/upload/files/divokekevetefawenujokaj.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://hepiran.com/cache/fck_files/file/ramarurozizot.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/xorafipo.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_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 19504 bytes
SHA-256: f421a58c80bad0366c62eeeb2d2078947cea4104f81ecdb6d89378c678b540f0
font_01_sfnt_off00012f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0D 10520 bytes
SHA-256: 9064cbd09d3995fd635b28cb1323fd872c36103724ee5ac736dfbe716b1e9c6f
font_02_sfnt_off0001474d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1