Malicious PDF — malware analysis report

Static analysis result for SHA-256 c229b0193a10bd1f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-30 12:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bcd10e60d8c86593587dc25238ec6d46 SHA-1: 056abdbe9fa3379804064e9b39f53a9d1bd5d022 SHA-256: c229b0193a10bd1f658eac76ad93797fda97938b6b070402b0c9f1e0a19266d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 link farm designed to host malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://serbanindustrialconstruct.ro/uploads/files/56074070008.pdf In PDF document text
    • http://franceplus.fr/userfiles/file/58656422909.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/jedegefaxulepi.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210921/file/genulezobovekozonidipefew.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/81613121259.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/48344664784.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/95887508749.pdfIn PDF document text
    • https://yellowstonewildlife.com/zixilowubefe.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/sumagizunimarox.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/55081316025.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/70933839582.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1bkfboctdh2pj4sepf3sd7ropn/gijutujofune.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/28825360906.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/33880281918.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161363371d24c4---zajidi.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/44009476294.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/banenivizowazido.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/90259556265.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/tetefulapazobatofuges.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/tuvaju.pdfIn PDF document text
    • http://lblussana.it/images/file/rewiwonumisuwuxutobosozim.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/vuxibopapowenodekosoxeja.pdfIn PDF document text
    • http://recviem.ru/img/upload/46387952431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+find+message+center+number+in+androidPDF 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_off0000b43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43C 11088 bytes
SHA-256: 3af7238d2d843a709e2701c405f4d374761fffb26306afbfde104f25c0b9fcb4
font_01_sfnt_off0000cde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE2 18276 bytes
SHA-256: 85d0f5ac66d40f533635595b4b67dde992ee62beb75865ab651f62061fd30936
font_02_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1