Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66447b07d4bf5c3…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 05:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c56f21338d46e833175427a9302a6cd1 SHA-1: a56609b071a38328ed52b023b7c143398f38f815 SHA-256: e66447b07d4bf5c3b38a1a9ed74a547f8e2a6eca0ec5401b0b233b68ab706aa2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=install+ubuntu+on+android PDF link annotation
    • http://garankuccu.com/upload/fckimagesfile/ed7ef4d341ae839d24bea44f7d4d57b0.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/xaxifagotafasedewo.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/4993156261.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4a3a969db15932a9d500d32ebe2dea44/dekilowemisalowevexu.pdfIn PDF document text
    • http://dolgoprudnyj.inhome360.ru/admin/ckfinder/userfiles/files/belinasepikamilulowe.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/38724792431.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/gijiwulaxuz.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3d24c087ea4a9a0dfcb61b0f27d06eb2/2725493394.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/21924781559.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210915190918849612scxvp.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/11443043673.pdfIn PDF document text
    • https://vitanov.rs/files/rixagebenikobisaw.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/70780073801.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/2991744466.pdfIn PDF document text
    • https://nada70.org/userfiles/file/71053477267.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/doludulufavenemodapo.pdfIn PDF document text
    • http://tdbm.vn/upload/files/titazovo.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/setufolawo.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/50318067594.pdfIn PDF document text
    • https://senfina.top/uploads/files/10747785225.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/nulid.pdfIn PDF document text
    • https://seger.cz/userfiles/file/sodevoretubepiretosimobik.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/sojozefukem.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_off0000b072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB072 10300 bytes
SHA-256: ae9ce0bc2b3e8289340eebc4bed515041f50c4df347ff72ab91b106eb5346a76
font_01_sfnt_off0000c7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 17136 bytes
SHA-256: 3d9793735ab7a9725934873d9211bb4b5827312b0e2bd41a60ed931001a5ee62