Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66eec82b1860bab…

MALICIOUS

PDF

91.7 KB Created: 2021-09-21 03:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1537bae2776d1182b87203b0928d4d1a SHA-1: b66de3a65f894176d21542efc7994b4ef832e958 SHA-256: a66eec82b1860babd7e007a5e2f47a813de59e974881bec35ded519427314c51
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://slxiang.com/v15/Upload/file/20219152154552243.pdf In PDF document text
    • http://biaikatolikus.hu/files/file/vaxenosuxotodigozalowes.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/gitok.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/gefipovokaxi.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/sedawabaxanilajiboromi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7cc794999b11fa0d2687699fe2529961/nizekufovafevaj.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///rapedewobiridikabaxebus.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/59442394653.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/titutifi.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/dujawi.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/nategezoxowidezepuvajuro.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/vitaridig.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/xipoleleruzoluxuxuzox.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/zameniveguwobivaj.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/59570013701.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/guluduzakakobajowomunudo.pdfIn PDF document text
    • https://anakmeong.com/contents/files/lasaw.pdfIn PDF document text
    • http://eternaseguros.net/files/files/nasidaretuk.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/71467240187.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614075959a404---74299614541.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/3526031106.pdfIn PDF document text
    • https://triosms.com/userfiles/file/vitetosibirovib.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/52541234361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pdf+the+courage+to+be+dislikedPDF 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_off00010131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 10984 bytes
SHA-256: cb22663a8cc7e06049bdd6715615e063898b55cea0caf58d4e535dbbb8fb130c
font_01_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 18120 bytes
SHA-256: 7d8d2872be53d59506be404c3c2d2f7d198c75d12796bf6003dfe646fb75a079
font_02_sfnt_off0001495e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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