Malicious PDF — malware analysis report

Static analysis result for SHA-256 2109511c330e186c…

MALICIOUS

PDF

90.7 KB Created: 2021-09-21 03:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1df03d9a9157d2c86bcab3ea2c7513f SHA-1: 7863819ce4ddfa40f71fddf31b279617e131c05f SHA-256: 2109511c330e186c8d6553483bf1c13334c1a92a2a694f374bdafe454147194a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm designed to obscure the ultimate destination. The PDF structure and embedded content indicate it's likely part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilus.cz/userfiles/file/robuzuj.pdf
    • https://petala.gr/userfiles/file/kagisipugonetoku.pdf
    • http://nirmalapublicschoolerumely.com/userfiles/file/70927068376.pdf
    • http://whatdwellswithin.com/file/86307057924.pdf
    • http://estatepie.com/files/userfiles/file/xiwor.pdf
    • http://lagunaapartman.hu/images/user/file/5528258757.pdf
    • http://vattucongtrinh.com/userfiles/file/xesenoweluxeru.pdf
    • http://kartelabasligi.com/images_upload/files/25728412615.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137909fab328---deketununujigijixote.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/sijusazara.pdf
    • https://insolite.lu/img/userfiles/files/24482172068.pdf
    • https://needletherapy.eu/upload/file/kevijikufez.pdf
    • http://melly-incendie.fr/img_db/gesiti.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sopumipefomezen.pdf
    • http://zoldjogsi.hu/uploads/files/67799890425.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396379e536---71374950104.pdf
    • https://tavio.ru/files/file/ruvajo.pdf
    • https://grandegroup.net/files/nirozumurabimofagagabaw.pdf
    • https://ruh-center.ru/userfiles/file/pejuwixigeluvarewawa.pdf
    • https://jmtours.co/aym_image/files/mejazolep.pdf
    • http://status-go.net/gfx/userfiles/files/wipigibibowelemiwabo.pdf
    • https://kaptenhoki.com/contents/files/paraf.pdf
    • http://finemetal-cn.com/upload/files/84725246692.pdf
    • http://domario.ru/userfiles/file/kibowimerulefo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=something+that+starts+with+g
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff9d.bin
6236dd5cc4adbf0be84df32ea81fed6bc2fd8c8767de1c2db08702f279e7d711		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 17320 bytes
font_01_sfnt_off00012c77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 16792 bytes
font_02_sfnt_off0001448e.bin
8e77f8a138de340d080b9c9e6d9f8ff3be35abdb254575a3646e1c778e50ce2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1448E 10668 bytes

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