Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b0442b18919884…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 01:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d178e84ae81e3719bdc9daca0af2963 SHA-1: 8489effd51021acbd18957d036b82fc017f8cbbc SHA-256: 95b0442b1891988481751d1e1f199c6c5dec65bdca9112b1dd8f2fb118a56cf0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The primary attack vector appears to be users clicking on links within the document, leading them to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://efficientinfocomm.com/ckfinder/userfiles/files/zorekidapuwebaxidoredivus.pdf In PDF document text
    • http://lawngo.net/fckfiles/buwufokewax.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/60200887078.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/64441129185.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/40053630178.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/tirimif.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/givemuteka.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/69177302581.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140582385b21---61091025629.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d332e6dc8b---doxojisapevepifajevugu.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/39932062383.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/85153147302.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/15825657120.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/19458166895.pdfIn PDF document text
    • https://motecx.com/images/file/wefumemopepoboxe.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/43217927181.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/devebofedojajonutalipotef.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/wujavad.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/23267977668.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/25093290999.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/dojazokururuwadu.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/sosopejujifaniribe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=all+adblock+for+androidPDF 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_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 18756 bytes
SHA-256: b53c7c055e93269a0d7082b7a3a7b47bf41c0a7aeb575e5121aff9ddccd46251
font_01_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 10284 bytes
SHA-256: db8f5af77e2be853dfc122a3d159f27a628ffec9c3881026174e4ecfba4b7c16
font_02_sfnt_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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