Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b40ccf6f531fc41…

MALICIOUS

PDF

76.5 KB Created: 2021-09-14 15:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 797f630c0046e7d0b2b1ded1a44de774 SHA-1: afc5a59fe118858aa6ef0432f46151169431fdc1 SHA-256: 4b40ccf6f531fc41288c4ecc35964b19bd85a2a7dc4a32b01f301ec5313b2b56
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to potentially harmful sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://people11people.com/uploads/File/41290396846.pdf In PDF document text
    • http://rockpapersun.com/upload_mce_image/file/38326880369.pdfIn PDF document text
    • http://esistore.be/userfiles/file/72423820070.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210901131428.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/94413286804.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/lanarufalorudupukako.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/15652884445.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/wunokosepewej.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/60138241931.pdfIn PDF document text
    • https://camelcarpet.org/d/files/pejenofojelekilokimuwijid.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tovatije.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/74563138563.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/89191946846.pdfIn PDF document text
    • http://aven.su/userfiles/file/fugetinowibubil.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/23702027379.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/vosolaxezilatanadizaji.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kusixeralaxufoze.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/zusigitotowutomej.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/99130114424.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/linojoludulegab.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/sarisovikikopowikeje.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161398c4fd6c4f---moworatubekuvomuwepagowiz.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/tokinobodegonud.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/veduvetezokoxomod.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/lurorajekimejimokojitorab.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/65it9ju6dvarbks75feqkrdl71/99312907766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=la+borra+del+cafe+pdfPDF 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_off0000c53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53A 10248 bytes
SHA-256: 539e476b392d580a065c2154ddac8c4d2b422dce425443a8f999c287c585e507
font_01_sfnt_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 18932 bytes
SHA-256: b33b02f25ddea76ce8a28139ac7b0f7a712a470339655c797865e45c5585872a
font_02_sfnt_off00010cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1