Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89b40432c8f4989…

MALICIOUS

PDF

77.2 KB Created: 2021-09-13 03:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7b50a6e27ea824df1f0d71df277670b3 SHA-1: bd4605a5bc9168f805c9ab4ce93359f48a279f1e SHA-256: d89b40432c8f49896ab997defc52ab064466fddf81f65db62899d210d560daa0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to external PDF files, indicating a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are intended to obscure the true destination or spread across disposable domains. While no scripts were explicitly extracted, the nature of the embedded links and the ML detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://pentas.eu/userfiles/file/wosuvosuxugo.pdf In PDF document text
    • http://abwwilson.com/uploads/files/nebivewegefob.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/22077839352.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/vizugo.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/13662092621.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/nokesez.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/jogefewalafabaxal.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/dofekokavimexorasalavuli.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/wijejod.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/dasaganawotol.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16130f9f98c129---71268572910.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/gawobafoz.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/tusuxonapizabodazedi.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/97295005075.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/vinezorumaxitatur.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/9400274723.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/60822784588.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/zelimoluzelu.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/tajitusuwoso.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/zunamidapodul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=merge+dragons+apk+unlimited+gemsPDF 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_off0000c948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC948 17476 bytes
SHA-256: 91de545d5d4a960cc87569fd6425f8e9e8355e861b9d2e1b8a57f3e91534233d
font_01_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 10920 bytes
SHA-256: 14ceb6e3aafd0161b1a412cf854d4b5920cdb767f11c9735ffb75b5bd0005536
font_02_sfnt_off00010f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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