Malicious PDF — malware analysis report

Static analysis result for SHA-256 96da3e6abedad56f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 08:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3b101b3c458f2abfaad832ec7d9e31d SHA-1: 7eaf3a0cdd017797c2c933d518f4888986e1cb21 SHA-256: 96da3e6abedad56f047ad6025585cdd8bf9116b815746dd44eb221a3ed7a4beb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as a link farm. 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 are consistent with techniques used to redirect users to malicious 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 http://tatishev.ru/admin/ckfinder/userfiles/files/75236069002.pdf In PDF document text
    • http://nbmounts.com/userfiles/file/1631766054.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/52575134503.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/61903088149.pdfIn PDF document text
    • http://kccmaul.com/files/files/5276365776.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0c4621b8---16424436634.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ecfc164c47959d9a518c23a0557a1ecc/dofubodixefodifagumigigi.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/zofamiredad.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/18457941988.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/sapafazajotimetogi.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/78273758259.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/93220148458.pdfIn PDF document text
    • https://adci.vn/data/upload/file/kigoposobixok.pdfIn PDF document text
    • http://ch-yang.com/upload/files/zowuziwarolewufagurunowat.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/64292077565.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/vilobagagovat.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/mokenokosareraj.pdfIn PDF document text
    • http://usagimatur.com/files/others/pumosuxolalapepatizezane.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/betatotatet.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/gagatoropalatekifobakup.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/81218596970.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/tisonezozepidamar.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/23562621087.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/61515947178.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/54066956011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ben+goldacre+bad+science+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_off0000defe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 18172 bytes
SHA-256: ee10f323efb5addc17ab32f7d5592093d0b67e91e53581089f1b158eb09e477d
font_02_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 10888 bytes
SHA-256: 863fa8764eff3768b3d8820d6f5c32a9585da1e8856eb48fb97034512936eb6a