Malicious PDF — malware analysis report

Static analysis result for SHA-256 892a5f2e1e21855a…

MALICIOUS

PDF

72.9 KB Created: 2021-09-11 03:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c6cdde580c13a7b3a3891e307b57095 SHA-1: 54a995bdd16b29bd1179035dcfb410e27d116215 SHA-256: 892a5f2e1e21855afd4bb84bdbeb2773c122c4640a3badfce42cef1408e34d7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'pixomot.ru', suggests the document is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a large number of links on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=fifa+mobile+21+android+download PDF link annotation
    • https://pristineleather.com/userfiles/file/67045002598.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/71150712881.pdfIn PDF document text
    • http://hainfelderteich.at/45084850846.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210911082132.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/gojadubekesojanobo.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/suxutevolerojepo.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/33399512271.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/80827458449.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/babaxeruropivipuxad.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/24135459248.pdfIn PDF document text
    • http://leton.pl/userfiles/file/zexenaxebese.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/leduzolow.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/podebavisunibibov.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/dodulevebalogonurizobij.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/66749944578.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161320082190ce---38989209354.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/narawexukemuxazuj.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/fajevuka.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/77078642374.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/felesifanisulipurijiwo.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/zofoweturazejanotifejab.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/69128628281.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/todirabojimalovatawewole.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gk04o28pakg75orpg43bu899u8/65510888855.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_off0000bd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD95 15724 bytes
SHA-256: e16e02a154ca495359255e29983a58358ec975c8d9f4c9398585436f6748b102
font_01_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 10624 bytes
SHA-256: 3ca2085114c87dfb6481f4831242c5a647b391e42073c7fbf5de48eb6786e939
font_02_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1