Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc11acf5a5a474dd…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 19:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 332ac5e9496ef7795eab5b9009a97b18 SHA-1: 08513fd0bcd44d9f635ccca8171f00ccb7c6489e SHA-256: fc11acf5a5a474dd4e8d930de44b913c628cceced477addea024e6a8f00a6dee
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to suspicious domains, suggests a phishing or link-farming attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely related to directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/viguma.pdf In PDF document text
    • http://home-hj.com/up_photo/file/todaz.pdfIn PDF document text
    • http://dentherapia.hu/files/file/12594761167.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/13373312315.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/xugazavaxawufam.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/85440285586.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/wogubumofaxu.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/57143068514.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/nofuvuwopugisitenux.pdfIn PDF document text
    • http://www.siposferenc.hu/html/73516403997.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/kofuvigu.pdfIn PDF document text
    • http://epmachine.ru/d/files/16733043624.pdfIn PDF document text
    • http://fruitvita.com/files/files/54648956086.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/68901539629.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/86900829273.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109080813529359.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab8031082---xibaremidesedagu.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/9110227916.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/jivaseda.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/pokadamamofi.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/kiruvapof.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/bitunasezisogodezaganimot.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/dutorusumapipasuzurutesil.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/likogonekudixev.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/wepepipakixisa.pdfIn PDF document text
    • https://thehouseproduction.net/file/98850530275.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/78914705857.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/gogarotevevufifuxiliwulug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+hack+instagram+account+on+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_off0000d49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 18044 bytes
SHA-256: 0178d8f977a059eaec560031ff62c416f4765de9149ab73ac5c8cb11d2a06b56
font_01_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 10908 bytes
SHA-256: 8e515dc175428eb2ab5c1e9671ad65f078cfcd04c7f0f28ddcabf9d2cc125161
font_02_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1