Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0f25a6b0b459b1…

MALICIOUS

PDF

78.0 KB Created: 2021-09-14 07:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 117e9d072118806d87629deb80a1680c SHA-1: 1e14e5bb4e0ba3aeee1625f184a3710f76c01a94 SHA-256: da0f25a6b0b459b1cce291a1e7c5fc72b954f7e4600988d0a98110e3d021e448
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. This suggests the document's primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e518f6948d---faduwamubile.pdf In PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/gerofoxovobafupimuxoku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eace227e1---73291458239.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/konisemuloletokokapa.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/9231989558.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/94717826596.pdfIn PDF document text
    • http://carbontuning.ru/file/6544667404.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/budunof.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/bujejako.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/3507373617.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/90152935370.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/96372118141.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/dewiwozigesuma.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/dazugemusupamonulovuvijis.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/83165380761329176e5c7b.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/tepanevadedaxujopudumox.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/44871823561.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/81909084985.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/nudoboja.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109130431071946.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/52733111508.pdfIn PDF document text
    • http://generaldistco.com/images/file/84952854253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sacred+marriage+pdf+downloadPDF 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_off0000ccc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC3 17244 bytes
SHA-256: d459a90fdcd376ebd83ff9c37783004adb7f6acf62252c7c2bcf54e68112d2fd
font_01_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 10856 bytes
SHA-256: f9ebd1dc5d9b3de7f2ae7817051617380fbaf3bade8fc96684914221ce2952fc