Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dae74604ef45fa…

MALICIOUS

PDF

76.0 KB Created: 2021-09-10 01:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 088e2908cc11825a99bb19f899797265 SHA-1: 7c8b82d40edbfd220a949863ea041aaf0f713037 SHA-256: b0dae74604ef45fa8dec31307034bd6b99d48f3338f6dff51f9fc70f32cf841b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs pointing to various domains, suggesting a phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://ketchas.ru/uplcv?utm_term=tetris+telecharger+gratuit+android PDF link annotation
    • http://terredellamagnagrecia.com/userfiles/files/binetopedez.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/93241697222.pdfIn PDF document text
    • http://packturf.fr/files/60713513994.pdfIn PDF document text
    • https://trexanh.net/upload/files/70699521354.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/rafukejivabavi.pdfIn PDF document text
    • https://equimat-cheval.fr/file/majolowapabojete.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/ramonetetexo.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/54884587900.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/fopidamipiz.pdfIn PDF document text
    • https://ever-progress.com/upload/files/28722253872.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109061245086785.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/9115091306.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210903_CFB46BEC0DDF8BA5.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/84229173399.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/22039467242.pdfIn PDF document text
    • http://askaudit.ru/price/sadivifa.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/zokegipuniramegukavababa.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/solezezu.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/36402238309.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/muxufumusamavokogifufavuw.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/raxinejur.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/kanido.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_off0000be8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 10712 bytes
SHA-256: 42594d37ac2f309955fad20f62a9029274ef88a97f190e86562e5fcce3652221
font_02_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 19684 bytes
SHA-256: f5682255c16fd763658830b949a7a79edb611cdb9d21d6a41a487242a137c38f

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