Malicious PDF — malware analysis report

Static analysis result for SHA-256 725fdb03bf5c4d8a…

MALICIOUS

PDF

70.4 KB Created: 2021-09-18 23:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 98c121976a376aabfcd37da6194cb06a SHA-1: f78980d4ed31ff214f28f8e8eac96cb2bb55cb47 SHA-256: 725fdb03bf5c4d8aea1045febe330920233b93bc7c4ff1d57f7a24f55b700f52
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains embedded JavaScript and numerous external URIs, including one that appears to be a link farm on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=marvel+avengers+academy+android PDF link annotation
    • http://tomboy2.com/images/library/File/11992540936.pdfIn PDF document text
    • https://egca.fr/userfiles/file/2161329251.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/6223797665.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/tekimin.pdfIn PDF document text
    • http://redactron.com/userfiles/file/rogemepanorazezufode.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/woratamokijiri.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/75617117382.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/58300349422.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/uh0d183hgdjtvs1k9vj65skt2q/mewedupajasa.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/romesiditar.pdfIn PDF document text
    • http://amandamaitland.com/images/file/83378903709.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/zuremibiw.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/vefodotanini.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/romozevuzu.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/vunibudexaf.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161334a4cbf5fa---86031392174.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/39750810058.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/jotov.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/ditotulofiresojedavi.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210918_B96EEF283F96A4A8.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/zafufepiguluvedipipixol.pdfIn PDF document text
    • http://thongthien.vn/upload/files/zigeviwiju.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/78609837417.pdfIn PDF document text
    • 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_off0000af3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3B 16904 bytes
SHA-256: 7dec37bde4d8611364392be1a240f09e19a430ad9f6749ebea1fe110083782b4
font_01_sfnt_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 10788 bytes
SHA-256: 463652be980246c524e7af90d1da1495d60a59fe160b01b0585fd21cf1a1be53

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