Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b041228835f4da…

MALICIOUS

PDF

73.4 KB Created: 2021-09-13 02:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 583179c5b36212ba10ea2102c5a34b90 SHA-1: a4f8774b8344889d001e37f650cf23b4a15e88c2 SHA-256: 46b041228835f4da8c2a523ed140da950b8f690c9daa65731ecf5088c5cffa64
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 suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://osmed.cz/app/webroot/files/files/35411548298.pdf In PDF document text
    • https://fulzugaskozpont.hu/files/82529037011.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/85985504558.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/18455496321.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/22893364073.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/miwikijof.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/77728170947.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/83111193039.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/94349279393.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6aaab8389---75875494910.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/8885853576.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/wuxubanoxixesawarug.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/24797820790.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/55800736149.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/27891804699.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/66061950660.pdfIn PDF document text
    • https://vontobel.shopbyeberli.ch/userfiles/files/lafimasepe.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/fagilinovusafowesorozuz.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210903172319.pdfIn PDF document text
    • http://www.520amis.com/upload/files/givibuzizugisopexa.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/35674435576.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/tizidapamof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=explain+in+detail+osi+reference+modelPDF 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_off0000bdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEC 10868 bytes
SHA-256: c4447448e59b00ae3702ff603a3239a763bad4ab5f39664dceafe37b4a8f4cbb
font_01_sfnt_off0000d703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 15920 bytes
SHA-256: 2314a7ae2822d0d34eab25c10b82fa0f109279cad4e2bcc7ed11a60569d4d783

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