Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ab371700929013…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 20:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 735aa0e37487aaa0e637692f7573e8c2 SHA-1: 460a3add70513a7af774ef24e4e9c8823ca1eeb4 SHA-256: e4ab371700929013b7b2894e45dea608d6709442bb993af04f35690b5ac64da1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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 http://ozhelalikram.de/resimler/files/13784102629.pdf In PDF document text
    • http://alt-1c.ru/userfiles/file/84307212381.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/penawutiw.pdfIn PDF document text
    • http://friulanapanini.com/images/file/50294590515.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/1dvi3ms7eujghjn8ffn99esai6/gurawi.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/vefazi.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/jomenapujulizof.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/79424133.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335d845fc20---fatiwodedugixi.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/fawabekiba.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/sulule.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/19502278747.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/8810744219.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/93919247179.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/dekusenajuvawiju.pdfIn PDF document text
    • https://susta.vn/userfiles/file/kabikubamaputagikudowo.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/tidaravusude.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/watoxezajejitunixosiza.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/majafix.pdfIn PDF document text
    • https://0900107678.com/upload/file/782585313.pdfIn PDF document text
    • http://autovoda.ru/upload/files/wolivizob.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/91593567745.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/84839104547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=alice+academy+manga+pdf+downloadPDF 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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 21560 bytes
SHA-256: 0140391e3f5cd33e149cfe7548e21a720b1a8cb0cfce9a5725955d5eec11ffaf
font_02_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 10776 bytes
SHA-256: efda7ed4f0dd8592304f498129e97c5b7c7679f994d58f325244148f91723d9d

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