Malicious PDF — malware analysis report

Static analysis result for SHA-256 08464ce26a06c4bf…

MALICIOUS

PDF

67.4 KB Created: 2021-10-01 04:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0000bfb9a6f94be1b6293d4717fc0f95 SHA-1: 4481b44f66eff3199adabd805d8e5ff4816b33f5 SHA-256: 08464ce26a06c4bfba811b7f9458deab96651152a8ff4be6de16aaf36c427cfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts with limited links per host, a common tactic for evading detection and distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://phr4u.com/files/xexunogufojomi.pdf In PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/vewadomegodiraleviwowubaj.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/rapofexosiwixose.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/rasikevobowudegikasu.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/zolisanutasibudugewog.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/tiloso.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/zitezir.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/lidubuja.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/78201875882.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/kididimufesepixevibi.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/biboz.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/vizobadimosonazamuxobulot.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/kopiwuzupikosewad.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/vozajodujo.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/85825194786.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/66298262336.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/sudufopuxipirepaxanup.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/29374154108.pdfIn PDF document text
    • http://www.moyekolodin.com/files/87231042921.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/666688075.pdfIn PDF document text
    • http://secretinvitation.net/images/files/58756875943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=when+will+mha+season+5+be+releasedPDF 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_off0000aad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EF 10768 bytes
SHA-256: a588ed2e4fad033e108647ebb1595b75ac4d59f56b9d4658eeec601aa2a1ab9a
font_02_sfnt_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 14688 bytes
SHA-256: 94612a01420adbc545bcd9cdec44a925293fe59ad431e53726af1b37ece9f697

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