Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff925ebaa7b059d7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 19:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01841441cfa0ee2e45a6a66c83a724f7 SHA-1: 1ea224eb8b0e0a8def9b7ca548a4af0e4d3b33a6 SHA-256: ff925ebaa7b059d7bf9653f34072ccb234928a0aa2d293a32af75cc15ca5c08f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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 document is designed to host numerous links, likely leading to phishing sites or malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cheeselicious.net/UserFiles/file/fobeluwupiniz.pdf In PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e4335d8c0478bfb042d0f4da6016c55b/49757959036.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16147f2e26668f---fekutilirunodarix.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210918071805420.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/bovesad.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/medewojajebubap.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/51244439249.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/saperasovovekusanajoji.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/xulaja.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/puxini.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/26940954057.pdfIn PDF document text
    • http://grimastone.ru/files/42865773623.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/lolotav.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/munewimapegufevulik.pdfIn PDF document text
    • http://glassick.com/userfiles/file/ruvefodupunupufaxomup.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/96239869890.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/84642578230.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/sojuwolokupenopofugik.pdfIn PDF document text
    • http://artdental.hu/editor_up/lokami.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/kudepawanezimadegasoguvi.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/kigoxenetarivekopow.pdfIn PDF document text
    • http://partnercable.hu/files/letigisojelajipolobiga.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/60703093284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sdk+location+cannot+be+at+the+filesystem+rootPDF 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_off0000d7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 20944 bytes
SHA-256: f79a35ecd1ea7c6750082a8dc4d12ae7fcfb7bf7c9d799417c95a08c6c1409ff
font_01_sfnt_off00010f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 11164 bytes
SHA-256: 3f6d8ea0aab23eb99394a08e3414d90cf4a02f8822629002356a95a4f65110a0
font_02_sfnt_off0001294a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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