Malicious PDF — malware analysis report

Static analysis result for SHA-256 439bc4c3802dcbe7…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 00:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b105e1cb2316caf302941a5b7f4e635d SHA-1: ae1e80e226db79af86572763d8c8f8b967fa723a SHA-256: 439bc4c3802dcbe75c8d1e0833c046b27f9f93e1950f157665191d270497d4bd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used in phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://edu-mate.kr/_UploadFile/Images/file/76261503824.pdf In PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/88544646055.pdfIn PDF document text
    • https://wmu24.ru/media/file/7745358157.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/wivanunevunedeme.pdfIn PDF document text
    • https://ijp2.com/contents/files/kevojexepexudude.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/nafelediresexu.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16145a6f85d0c2---pugokoseminazigelido.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/80646114536.pdfIn PDF document text
    • http://esangsok.com/upfile/files/70102321715.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/wutekidunafudep.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/97915574708.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/vozozitiw.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/67382897328.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/29115753898.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/seperaxufo.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/15505298520.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/kejijerawosa.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/18053787083.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/dubagevabowagujowifezax.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/41983510071.pdfIn PDF document text
    • http://dsfly.com/uploads/files/tobakigil.pdfIn PDF document text
    • http://feg.vn/uploads/files/pelipitema.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/sobawesupukenegenawolalin.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/56907156684.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/96666198669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=photo+studio+app+download+for+androidPDF 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_off0000b71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71C 16472 bytes
SHA-256: 2065edf263ed806d8d01482c73a0d3e8823f402f04d5e8b18b2321d79f895aa0
font_01_sfnt_off0000e123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 10648 bytes
SHA-256: 0206c54aa624463ed9780937b71ac53716865d093a4937e96c0e627945dcc370
font_02_sfnt_off0000f985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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