Malicious PDF — malware analysis report

Static analysis result for SHA-256 93515cc34b136d0c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 22:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b27d726cad04f7ec3b4fc31ed406d709 SHA-1: 2328775d2f518926f42d4e9b8f7f3c14aba70678 SHA-256: 93515cc34b136d0c43daa525ab16c81d98499bc8fd9a42d11f86362f3b316715
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high density of links to potentially malicious domains. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://lunaleo.pl/userfiles/file/20470627552.pdf In PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/55969907426.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/peminebexabujibikaditiz.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/56502335140.pdfIn PDF document text
    • http://17njl.com/userfiles/files/16604567382.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/naluxazanijuli.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc0a5bd7b---mixuwof.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/36658519054.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/vazuxeg.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/4051624276.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/47161874102.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/balopiparukupemolipakin.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/kokodedababosi.pdfIn PDF document text
    • https://etadelloro.it/images/file/filinogum.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210921152452_a9zfcv.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/80685855178.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/xosapusikele.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/41408232881.pdfIn PDF document text
    • https://premium-house.uz/images/file/54376025231.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/nivopolojo.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/sibogujitelefibofogodewe.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/l9paeqvrgrktvt5q4nvp7uv0dv/97189175498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=test+android+battery+capacityPDF 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_off0000b078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB078 16948 bytes
SHA-256: 50c3e030a4012de530287aa8735e925903d5361c88f929e0dced98bcab70c2de
font_01_sfnt_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 10680 bytes
SHA-256: d39e9367b2eb0881c63603f12846b50ba4c3e13d0ec0465734faf56b47bba1d8
font_02_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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