Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abcc0635f75845c…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 01:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 006b2da8fbef32300ea5e34c3b717f7e SHA-1: c37a845d62c5c1c8365b5fe2acb33bf089cabddd SHA-256: 6abcc0635f75845cdec36ce65dbdaeb5b9e9bdc0d7413e9aadb056d13594cf9c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. The presence of numerous links, many pointing to unknown domains, and a heuristic firing for 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or redirection scheme. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://openendrep.com/userfiles/files/62059998429.pdf In PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/mumobixorifotapitif.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/kokazapudexevut.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/21024426897.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/jadoz.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/19337976334.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/39259729452.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/wawasuwug.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/34611886472.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/raziniporul.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/mizuru.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///53926725420.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/jogewijokaxujuvobit.pdfIn PDF document text
    • https://edusfera.pl/upload/file/66173498666.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/zanonebifitim.pdfIn PDF document text
    • https://banghenails.com/upload/file/22084506061.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d040d8eea2---rabuw.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/32258785168.pdfIn PDF document text
    • http://machin.kr/userData/board/file/pebomomo.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/suzevoxumomotokor.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/64124975276.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/25540151078.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/25827393019.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/fivedunuradil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=is+68+a+prime+or+composite+numberPDF 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_off0000b165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB165 15488 bytes
SHA-256: e4897d46c93af408aa0a56f02b7c834022a6c7b27b82c595e458bb252427775d
font_01_sfnt_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 11056 bytes
SHA-256: c302c3a3578498d31064d9564290dbeaf3cddd6f40628a02c9dc05913b4f368f

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