Malicious PDF — malware analysis report

Static analysis result for SHA-256 609261f8a209b4c0…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 10:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b75d3bffb453f1d4656f896ae5d8d682 SHA-1: 14253cfabd646347d3e296f66726b54153e0618a SHA-256: 609261f8a209b4c04b6b1fea554ace91757d07b5330cbbca7803d9817676cabc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF contains numerous links pointing to various domains, a common tactic for phishing or distributing malware. The embedded URLs, while many are marked benign, contribute to the overall picture of a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • 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.
  • 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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3gtgidjo8edm3g3sk7si27d3q6/816056540.pdf In PDF document text
    • https://rockeit.com/userfiles/file/debefetipasenegisaw.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/kakajova.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/50176910835.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210903/files/20210903131328.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/17517885238.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/12419082283.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/tikowexugadebosotodaba.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e66f0e8b4d---dabewig.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/33190060239.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/57884767865.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/fewaxaxomi.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210909_39C5CDFFCA4BF10A.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/xotadokowewuxi.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/87970066414.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/5829710977.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/76382642664.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/70176602066.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/fudawufozatazoxurixeba.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/26752544399.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/17394701289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=top+notch+1+third+edition+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_off0000c825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC825 10544 bytes
SHA-256: ca695810544076c9cba3b2d72eea1c78f07b0f34a99dff5db9da80059ea97157
font_01_sfnt_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 18308 bytes
SHA-256: 652c1279bdccfc7953bf6124b0a51b3ea0a985f0979e0ae408e2c40a91cf2e0e
font_02_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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