Malicious PDF — malware analysis report

Static analysis result for SHA-256 70facd319f171ea8…

MALICIOUS

PDF

68.4 KB Created: 2021-10-04 04:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7bab9aafbf5a190795341e81a8ec3faf SHA-1: 1ed55e062007be639b6b35b29abb53b7c9f4d857 SHA-256: 70facd319f171ea8c23879d6a9aa53c6d4d5cb35afd010fd6cc7d0ee96139df6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the PDF's primary function is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://synerhu.ru/uplcv?utm_term=heavy+bleeding+during+periods PDF link annotation
    • http://tgtech-auto.com/userfiles/file/suxovokogopotogoparazoj.pdfIn PDF document text
    • http://retailjewellerindiaawards.com/userfiles/file/1003207154.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/rajiriteseguluxaga.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/94912520344.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/73148229633.pdfIn PDF document text
    • http://koddous.com/userfiles/file/384448445.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/nobimusebijusakik.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/44196662322.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/vavuruda.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/75714119513.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/woxugot.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/49989408230.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/14667228513.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/ligugotekibabika.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d7c6962f4---47962407064.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/48222976846.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/zazakofanotujadabomena.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/89288170785.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9988c5d8cedcb460e29e3c1daa2a8640/30464392390.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109171121003420.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/64535728200.pdfIn PDF document text
    • 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_off0000ae98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE98 14524 bytes
SHA-256: a03c81191aaebf03517efaf2671acb471d42ec137c148ae9ce8806be26b46256
font_01_sfnt_off0000d361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD361 10880 bytes
SHA-256: 78bc8c2e4c5414df2992e2301afa77c12fabc3ea2226753088f2badb70e7c08e
font_02_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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