Malicious PDF — malware analysis report

Static analysis result for SHA-256 f392e179d0ffb4ac…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 07:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7f9a5cf2a0dbee4799db116d50a7dcb SHA-1: ead1b93ce7e778e727247fedf404e80791efd8df SHA-256: f392e179d0ffb4acfdac43cfc6d4a127996071bbf5168e3a451b17c3cf00807c
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 PDF contains numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://yourownadviser.com/ckfinder/userfiles/files/54510275521.pdf In PDF document text
    • http://uniradioweb.info/userfiles/file/befarutasonefejemowuzig.pdfIn PDF document text
    • https://steammining.com/userfiles/file/16371288975.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210906235249105.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/zofijika.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/gotopanudepofew.pdfIn PDF document text
    • http://baove24h.info/upload/files/34782041185.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/bde183d9fddebadc7dc72dcc6e6004a5/sujuwatozaxaki.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/sosapemovurewome.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/jadanejakugijawu.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/jegigikolebemaxigij.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/85660213875.pdfIn PDF document text
    • http://timebymtm.com/upload/files/dojoligimozanavamu.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/wutirekadawiwunonozuxow.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/sisalixusawomidexevas.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/jaritoxusepe.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/27139810954.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/60441496102.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363b362fcdf---nunikesixexupakuw.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/duwirililamabam.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/natubaxabodanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=osu+on+macosPDF 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_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 19684 bytes
SHA-256: ac54b49d0b7c9026ef3d0956ac29292affd14fbb88dc0d1f1c9b72e415a8e726
font_01_sfnt_off00011ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D9 10048 bytes
SHA-256: 06de0455c45a837719b1228c9c82eeeb80ddf249ac1cf318363d2a14e0bb5856

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