Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4f79d61e790834…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 15:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f300d1a04b0e53f3436cf79e280fb304 SHA-1: b9d7b9f1cb012d600bba6d4982668ccfc4b1a1f2 SHA-256: 5f4f79d61e790834a6dce0eb287d82cedbd51719c8bf49af63177fca8cebfb9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://icon-studios.com/userfiles/file/62482943020.pdf In PDF document text
    • http://studiotecnicodama.it/userfiles/files/83243068917.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/64578547808.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/potizevovoxejopisij.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/5975103508.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/86862223740.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134817816bbe---pagopuriveduxigotaju.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/sudobo.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/10537653056.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/dasopereno.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/34856438331.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/74808047708.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/nefomalupobulinevixoval.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/zuvetawejag.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/rovadepotofo.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/45287616301.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/jexuniwurijilabiwedetori.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/48938439790.pdfIn PDF document text
    • http://ymmicro.com/files/files/jodilo.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/28500684560.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428dd1c65fc---bevuwugilikajizu.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/11843097827.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/58914090475.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/17960653781.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/fonigafesorib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=windows+7+windows+10+dual+bootPDF 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_off0000b323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 14820 bytes
SHA-256: 89d8944aa198a6b6a87aa79db4dfb4f7db50801aa828f6a675206097ca6fb79a
font_02_sfnt_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 10552 bytes
SHA-256: c8974e26efd02037a07b4e2ed990e4ac36b6eff9a781759cfa7efad8f5f92894