Malicious PDF — malware analysis report

Static analysis result for SHA-256 79114551c9f7c0e3…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 00:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ee05471816149b8f38f66f05c9d0930 SHA-1: fcc1a447d8d6993620e1935617893a92b3a219b0 SHA-256: 79114551c9f7c0e3ccf8c89e8c372fb0be51185c2d91515fcd660a45802a4b20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URIs, many of which are hosted on distinct domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/21521069322.pdf In PDF document text
    • http://capitaloffice.pl/fotki/file/vilimiropukideraduninon.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/pisazomasabujim.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/dabepidajiwevo.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/68198898655.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/25019748616.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/2f53faa2214fb8752799eee6cb7ebc63/mezebumexeguxo.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/44710009464.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/rudelitexijanotofitebe.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/79300297522.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/77579278338.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/tanigisojekatu.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/vogozapowe.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136249cb84b7---52311629656.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/rixovumimosozuwadu.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/mulajowexoseseduduwavilu.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/tubamiputofifetefewaneti.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/10093783427.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/17289858189.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/fuzojovevaxotegorame.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/35011737534.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/nakowotexitu.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/28797978480.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/miwomukovodugomojijijoxof.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/fugile.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/jebut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=hollywood+tamil+movie+download+tamilrockersPDF 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_off0000e8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 18516 bytes
SHA-256: f2bb01527bb0e128ea439d450a31e041c222293b4624bd21f898bbad0310ef27
font_01_sfnt_off000118d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D8 10880 bytes
SHA-256: d91f128d41885b0e990fe0fc609f605e804cb9c556e9e14581a07d794c9abd06
font_02_sfnt_off000131f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1