Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd98692d8778a20b…

MALICIOUS

PDF

86.2 KB Created: 2021-09-20 06:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20ce32b501062ac7d38bc4cc4414042c SHA-1: 8f5f59f314e30778feadc0a425c586bc7e498745 SHA-256: bd98692d8778a20bda1cf96059321a88d127fe8d53a550448790036a3dd6465a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to multiple distinct, potentially disposable domains. While no scripts were extracted, the presence of numerous embedded URLs points towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://abwmarlboropike.com/uploads/files/31616629201.pdf In PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/83361612328.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/38980136467.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kinolunokuwoxasabodubumal.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452285e957b---10819794229.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40168194363.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/botexewojamofuvizalozit.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d9aa68b1ca430507a261e9ad24c7b39a/koxaz.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/radisuluroriw.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///debozawo.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/34577600361.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/winuwifavorur.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/pupozituviwideko.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/85486346488.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-5/20210905023115784864.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091211442070554.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/benezikopinisif.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/50666298718.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/77732608729.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/76692989000.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/zadelirosutuviwog.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/38017624890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=h%C6%B0%E1%BB%9Bng+d%E1%BA%ABn+vi%E1%BB%87t+h%C3%B3a+game+android+tr%C3%AAn+pcPDF 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_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 31720 bytes
SHA-256: 0a8c5b7fa7eafe508db1458cddea023add51a9f96c86f8eec0ba0c902edd7721
font_01_sfnt_off000115c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD9 12000 bytes
SHA-256: 2a54f3707a9a21da26f5d5541a85082eccd2a2ba3eaffa6d4956f4b5db3ec90f

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