Malicious PDF — malware analysis report

Static analysis result for SHA-256 059f099b2dbf7e14…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 18:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6e1ef8ee5186a81d658052a45643b68b SHA-1: 35eca2e14b81a3be241d0b05cb9d1767eb4a47fd SHA-256: 059f099b2dbf7e14a03c7ddff13156204bcf2f8a63f93665211399fad65966e6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files, many hosted on potentially disposable domains, suggesting a link farm designed to obscure malicious activity. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to obtain a password for a separate archive, a common tactic to bypass gateway security. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16130325dc7305---joxawok.pdf In PDF document text
    • https://tl-systems.hu/files/files/loxobovimoguvawugogalunot.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/15017690677.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/fapezavidurozokalufas.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/91578409355.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/damarilevuxamusomesuz.pdfIn PDF document text
    • http://maksimetall.ru/files/67169921989.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/xijozudatajukuso.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/0a2c28e17dc6c0edfb37da003093f194.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/bezavivividalewetegivapa.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434c0be1bc4---85563872193.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/pewiletezev.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/dupesul.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/85811761779.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/xolatefojivenixom.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/20555558562.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/29011470991.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/17603417426.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/51648399206.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210909_04F3E03E73A8113D.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136d9f1172ec---90941742441.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/82789267438.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/golamarubulawizitiwawuzo.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/7039490687.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/pobukozarujerov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=gta+vice+city+android+zip+file+free+downloadPDF 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_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 10808 bytes
SHA-256: 7a50f2a2b5d5311bcebcbd563766600cd4818531ddddd4556cad487c33b5aa81
font_01_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 17736 bytes
SHA-256: 3abb1b9211d5e49dc4a4bf31434cc5202555d2783cf817f682332f9aa367dac4
font_02_sfnt_off00011abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1