Malicious PDF — malware analysis report

Static analysis result for SHA-256 0763a5ce4dd433cc…

MALICIOUS

PDF

78.6 KB Created: 2021-09-14 18:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 123817a723a9b40a04f0c092042627bc SHA-1: a560ee476081625ab58a7478ae01a79544579456 SHA-256: 0763a5ce4dd433cc92c21d701b7c115fb847f4421c0e2647f6e90c570184e834
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs pointing to potentially malicious domains, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, indicates a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://vinacoma3.vn/userfiles/file/pokonilovututo.pdf In PDF document text
    • http://ipea.kr/userData/board/file/lonifudiwugebuzotumizusog.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/41339845457.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/natokarojugemobulefez.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/lifomizedo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613642258213d---vovepopuxudenukim.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/83735987634.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/pusuw.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/xojixanabebikajodovuga.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/67104905160.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/gawasinapozizizi.pdfIn PDF document text
    • http://regmac.net/userfiles/files/72238108136.pdfIn PDF document text
    • http://cl-pub.com/files/files/dujedamigip.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/gadolojukazaguligapebev.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/e89mri1pnqoh330c000u05ee23/narumupixur.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/4827126649.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/67161529431.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/puligu.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/dekorigizojajarexog.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/18200729858.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/14255863611.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/fisalini.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/xaruzegapukimetewofatu.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/vebumama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=naruto+shippuden+128PDF 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_off0000cc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4C 18096 bytes
SHA-256: 8c594f2238924d9ec8f2517631a5d3a4351e844ce99201236fb160ddb6862757
font_01_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 10900 bytes
SHA-256: 647999ddeeed7db602f3e489fc8d5c2e4d0a396c90c5c63882f01a894db1cdd0