Malicious PDF — malware analysis report

Static analysis result for SHA-256 24172ff0d514fe70…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 18:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77df7a52ef9fa4e860a14840702848ee SHA-1: 18cd22f8f58cae54d023c60d6a00e107e1821744 SHA-256: 24172ff0d514fe70a3d16909de1bdd938e427b5de146384769071b6eebacf406
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kit-veron.my/ckfinder/userfiles/files/25668552137.pdf In PDF document text
    • http://wellogo.in/userfiles/file///fegobizuzikokizu.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/40526786065.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/woroxosebotovabonefir.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/66196966368.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/40085750671.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/kepejifewulotagefiku.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/jobovikesuvobur.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/jebabuze.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/23fbbba6549c01c1676f423500996a8c/warenuxulorola.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/wuvujogamufimitito.pdfIn PDF document text
    • https://cargotavio.ru/files/file/41714532744.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/vetumunowup.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/kagobasegojofuxuguroturub.pdfIn PDF document text
    • http://ore-processing.ru/d/files/55988592344.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/safezipesemawilevoti.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/febitirabuwirukodozik.pdfIn PDF document text
    • http://czyxchem.com/upload/files/68989973076.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/50395580200.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/42989043332.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/ripapikijumoromigenifalod.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/90008135539.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/88936990644.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/1003701606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mx+player+hdr+supportPDF 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_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 18416 bytes
SHA-256: 4f0a2a0f433de7821c12afe2b902a56c5b54031da379dae963bb88b65dc170ae
font_02_sfnt_off00012f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9B 10604 bytes
SHA-256: 14ed62dbca9a3ef0fcc2ab9536eaa3fb3ceb454b45ffc2eb52463709fd3464aa

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