Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1a3a79944c1e28…

MALICIOUS

PDF

71.4 KB Created: 2021-09-08 22:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10b9091bec9ea8fdf7a445112c739d64 SHA-1: cd91e4c30baede7e1e1cfcdfa3535ffc5b9c8642 SHA-256: 8f1a3a79944c1e28a509714694799dbca6085ca43261b75ee8d3b371955ee7c5
146 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/75776003704.pdf In PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/gasodadivukatose.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/44364109176.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/9723780008.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210905085720_MjM0NDcwODE3MQ==.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/telarupubukog.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/tupapuxojovet.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/86389923403.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/59478870272.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/lefatibel.pdfIn PDF document text
    • https://wittnebel.dk/file/fufaxuvixil.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/79493884781.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/jejamimosupukefef.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/nefisizawa.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3339d68550949408b38d31b3dfe55697/dinabok.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/69434619539.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/jukok.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109010828304910.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/piziwozafifedatav.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/sajadujuloludadozasuduvox.pdfIn PDF document text
    • http://emaaravm.net/upload/files/3033605598.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/wuzufatomojifuxibe.pdfIn PDF document text
    • https://stotex.rs/files/nanexubunawosagolu.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/49558702267.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109011905596249.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109050711466367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=scan+beyblade+burstPDF 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_off0000b505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB505 16956 bytes
SHA-256: ef744397e34cfb2cbc73dab890a3730882515606c59608b9bcb38659b4d09016
font_01_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 10580 bytes
SHA-256: 424593a28aad4a3d3de6fcdd980b2d03af046e248071fe793c8a1548c113b47e
font_02_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1