Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e472275c914a43…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 04:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e0618ddb78a60e439bf70d15ecb148e SHA-1: b5fc04ec7e8eeeaad8468020f59040016b952ca0 SHA-256: 79e472275c914a430f8ffd5bec966d992c6e4462913a2a8d2294327dd6c0fec8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, possibly involving the exploitation of PDF vulnerabilities or the delivery of further malicious content via the linked PDFs.

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://vipbeachhouse.com/uploads/editor/file/dewoxiberexipimoxikolopi.pdf In PDF document text
    • http://kibbkw.com/uploads/files/dikupitufar.pdfIn PDF document text
    • http://webbuilders.com/files/file/21191581488.pdfIn PDF document text
    • http://onecre.com/images/content/files/nofikelasaxav.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/30966442807.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/giwitamajiwajax.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/rijafemab.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/ponod.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/60595448456.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161442f7e1432c---mamafenagamimugaliwikisep.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/bowixewejidutaz.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/46051394069.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109100759383245.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/97354616078.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/fowijakatodexujobeger.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/19amra1omuf7h9n4jh3epolm21/xisozuru.pdfIn PDF document text
    • https://12shio2.com/contents/files/xefutotukelugabifiso.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/tadivuse.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/gusitofikemulif.pdfIn PDF document text
    • http://ttc-investco.com/img/files/butefawupazita.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/19390182583.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/39220137418.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/xagowewuzirijapu.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/gipepugusugonuwufobor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ojala+te+enamores+libro+pdfPDF 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_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 10956 bytes
SHA-256: e58c866f492130d635281829f2f534da055462455c2965fb007ba4e83ce1c8e6
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 19176 bytes
SHA-256: 4a9d3382c71b083403dde5422ac1238e9af22792e13d59c4a5cecedf7dd07855
font_02_sfnt_off00012447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1