Malicious PDF — malware analysis report

Static analysis result for SHA-256 871254793edc1cc0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 20:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b6d063ad30ab4f6ee9ff30df0a2f8df8 SHA-1: e9536ed2eca50703089e0401adc0653f0d196df7 SHA-256: 871254793edc1cc08f8b982c04273031ed9279866e579fa927ab7a1079fd2160
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and are used in link farms, suggesting a phishing or redirection scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of malicious intent to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=wifi+connection+failure+android PDF link annotation
    • http://jayeonrak.com/upfile_editor/2021/files/tijuwetezu.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/rugugujopobiwirezi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161415b2b93be4---91607127905.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/lozukadolugazaserij.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/51469820736.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/revepokimotikegigisu.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed90b1f1fe---doxoroz.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/sotogo.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/85982853342.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/foger.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/2030811077.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/rabekipil.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/guzoxofivewiserapivisipak.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/vuroxiwuduxumevukojavob.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/88367449988.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/robilasanususasajonubuje.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210908_045532.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/47518140074.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/joxonowixofer.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/fuzulafebef.pdfIn PDF document text
    • https://oasis-travel.ro/files/zabetatutowuloj.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090714332473499.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/5997525732.pdfIn PDF document text
    • https://intersat.lv/files/file/zazozewizidufulomegesapof.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/5534982048.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/kawilisepowonaz.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/34211285353.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_off0000d2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 16912 bytes
SHA-256: 78f3fe385df6de7a167840768438af45407d46339d13538da8eb31ce4a91f80b
font_01_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 10392 bytes
SHA-256: fdee5e42480809cb624aba34c3c5302ff34ac266ba52c27cd38d13527f2acb30