Malicious PDF — malware analysis report

Static analysis result for SHA-256 312c88c05cf23b5e…

MALICIOUS

PDF

92.3 KB Created: 2021-09-16 08:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 605bca9ad0196ebceeb51937b4b18aba SHA-1: 180b6fe894a8679bb63f54d788c8e94ded5ada94 SHA-256: 312c88c05cf23b5e8bcc8e5e40345cbebc753bc1860978b35507e3a1ff35fa8d
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, indicating malicious intent. The PDF contains numerous external links, many pointing to potentially disposable domains, suggesting a phishing or link-farming scheme. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/gmqlhf7h271ppst01f435tlfsf/39108664022.pdf In PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/54515389383.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/3897954263.pdfIn PDF document text
    • http://dsagco.com/Upload/file/56339413371.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/vamanawegimetiw.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/vatejonifulujitikazukoja.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/sogewasozokegexaxenifafuf.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/3869849055.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/tegamesaxe.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/dumitira.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/1989448570.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/92126475507.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/pilixipev.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/59586867013.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/wesovefukikejitolebug.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/39144205756.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210914193144.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6134090E77240.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/75168754211.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/64300036179.pdfIn PDF document text
    • https://etimes.mn/uploads/files/sesupepofima.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/nebevapodexezujolitenima.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9f6e9851---bijef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mha+the+movie+1PDF 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_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11188 10068 bytes
SHA-256: 820c5fc1b2e60646d947d957a166c277f2bcb0556d9dfd5f382895585d4057a3
font_02_sfnt_off000127ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FF 22272 bytes
SHA-256: 31185d24a133729b8bdd94a4132af53d8d1e702d6fbbdf93c0e7f10887bebbac