Malicious PDF — malware analysis report

Static analysis result for SHA-256 200c6b576a19e4ff…

MALICIOUS

PDF

86.1 KB Created: 2021-09-15 11:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c28a19188aeb997810a900d3b417d4d SHA-1: 1366564119c6aa87cc4786ccafb391d7f1a8c469 SHA-256: 200c6b576a19e4ff4da44c917022a5ff26c2d33071b788f7b0b5f19a9b4d17cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to a network of sites, potentially for SEO spam or to serve further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://telecycling.info/files/file/42151528871.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/50604802886.pdfIn PDF document text
    • https://renault-service.com/userfiles/82317579440.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109041008181725.pdfIn PDF document text
    • http://exosushi.com/uploads/files/17797046455.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/47029947752.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/xodokixo.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/wikuvavukutofo.pdfIn PDF document text
    • https://mlspoland.co/files/file/wofobuxenef.pdfIn PDF document text
    • http://rvhifi.cz/files/file/gavofilefurom.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/revow.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109091436323800.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/16763394655.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134482983be6---teguruv.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/rexukiguwazokekafu.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/nugixotogozalojuwekam.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/27286703974.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/fusak.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e528e6dfbd---42027378171.pdfIn PDF document text
    • http://packturf.fr/files/xasifotaxamalugetenoniti.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/jajitewatasenolatarezot.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/49062676454.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/31855434529.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/selefuxixozatewujirison.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/58231996295.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/36060445005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=words+beginning+with+sPDF 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_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 10536 bytes
SHA-256: 0a4e1bde7c15b59398875e9c75c9bb6ac6890dde22cc7fc68f324b8521820658
font_02_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 18180 bytes
SHA-256: 81c4d613fe9646d0d93dcf0209a32ee3a9431866e41ac6491a198c4f4c8b46fc