Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba704bb5fe7d045f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-13 11:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cdfc2b100ff82b24f1254e835883426c SHA-1: 9cd2f00353393de3208ccee132c8da4cdd448bd8 SHA-256: ba704bb5fe7d045f72084b5e1bc973e1d8c3ee124e4beb69a834f85eac4ff115
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 phishing or trojan threat. It contains a large number of embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a link farm designed to redirect users to harmful content. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure, likely intended to deliver a second-stage payload or lead to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc78c3700---gadugi.pdf In PDF document text
    • https://kentacademymiango.com/userfiles/file/nesodonupireberuxibori.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/10300267973.pdfIn PDF document text
    • http://fitviewer.de/files/file/kasaseliredolinexigalam.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/89750562890.pdfIn PDF document text
    • https://digireg.si/upload/92964500983.pdfIn PDF document text
    • http://headrepublic.pl/images/files/18365948288.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/zunavipe.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/29786074210.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/tisal.pdfIn PDF document text
    • https://duvanco.be/docs/files/kaliberodaxuwumubif.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/makupunadudumegimifete.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613982ce95c9e---44340559437.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/29429346788.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/vagoniru.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/51803520416.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/pilizisilopuxizasave.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/sosimogejelejisaxijo.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/wimexodatozosipotuwemew.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/36892575538.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/tilibizawegukogefufaned.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=most+popular+io+gamesPDF 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_off0000b0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BF 14900 bytes
SHA-256: 9deadb6a1017e9b37ed79a5be2779e089fb4fb4e1ddb7ca4a2c41ce741723ee1
font_01_sfnt_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 10584 bytes
SHA-256: 74a95cdf2f717c245cabe6fbe4bcb8a971d9700de888e31200887f4371cad660

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