Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2279d3a6d82ab5…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 00:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 187d1eb069c073bebc820829f788f72e SHA-1: 2e37e2e72d4ab43dfd978edd147cda016193aa02 SHA-256: ef2279d3a6d82ab5fb758d44c690db94daa02ad19d9254c6c90babd7e1653a3f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ranch.pl/files/file/jabupetudivararepuwolube.pdf In PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/vikatogewixamed.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/dubelutiw.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/xanox.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/40728850681.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/moduwaj.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/89753379556.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/58400508498.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/23512797625.pdfIn PDF document text
    • https://agermag.ro/mm/file/29729784109.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/jazadoramaluvatuvariguto.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/dosofe.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/50682534050.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/dowenaxavibife.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/23177126397.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/044dmlnub23r7u2d5j0bm5s3s0/zovisuwomukupipeneravogo.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/87604315824.pdfIn PDF document text
    • http://melabo.com/upload/files/67978580949.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/jegipudulewudixojazogif.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/9365691576.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/34498676744.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/76415142375.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb796cc752---78243914631.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/8271358422.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/kuvivakofobupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=things+you+can+enchant+in+minecraftPDF 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_off0000d298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 10916 bytes
SHA-256: 5e2725953cbe28aca3dd0994e4e4b9feed14f3d39ba5280edbafafb52b686e46
font_02_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 17600 bytes
SHA-256: f84c3932d4f353b6f0381bdd03e324e959138396c55e1810d17d2ebd1699737e