Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b699fd21a10efd…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 10:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e06e8c18a072f21820a8b4fb63e51b6c SHA-1: e455e2ae5193e5403bd134fc9f896cb850033805 SHA-256: 83b699fd21a10efd2c5644a74b6b0b473231c78ed72282a43fe31bdb828c86a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable domains, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kalyna.ua/sites/default/files/userfiles/file/pajomejezivomugidabuna.pdf In PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/67920387637.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134bec4e3479---sopaxumev.pdfIn PDF document text
    • https://termoformat.md/img/files/pavololapawop.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/35102395350.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/kuzuzajisomisowosupigiju.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/23423611596.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/88896302414.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/77833824477.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/baxejamobafobadozubizone.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/77835729858.pdfIn PDF document text
    • https://halkum.rs/files/wokapukubisifofi.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/vebomefetamigutizizepoxox.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/kosutozitupafusifuxiziwu.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/17561649445.pdfIn PDF document text
    • http://ranch.pl/files/file/nelezesinelusujuw.pdfIn PDF document text
    • https://thepainter.asia/upload/files/gabikete.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/81891912634.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/47390197950.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/retudidolumesixejugaziw.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202108312026071030.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/79271271035.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6t8bqhft1m0mo47skfoptamk63/tedapatexefeliwavo.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/sipajelowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tiny+thief+download+play+storePDF 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_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 10760 bytes
SHA-256: d64d52bcdbcbcc2530bea5a50a5f02353843bf2207f6923595b7bd4b5cab3780
font_02_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 16412 bytes
SHA-256: 19a582aa268d7bd2cda0cfe9292056384bdff56b81f35bbb48e825311af4c761