Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd44e80197cf384b…

MALICIOUS

PDF

86.1 KB Created: 2021-09-16 05:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae98befd7b02390c3f1a6d973ea92acb SHA-1: ec9405333788e637a0995f1acb5309e7bff12aba SHA-256: bd44e80197cf384bb269a9af2f1720b1d6b91e304893bcf29cdd3147003e38a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://1877painters.com/FCKeditor/file/tudogixawitugamube.pdf In PDF document text
    • http://scandirent-new.ru/uploads/assets/file/pupibazusigiweluwazodes.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/26413310698.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/zebuvuduxape.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210902020321.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/kuxozefa.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/fuhdi8925eb7kndsrprfctt8a9/wevuzimimowagug.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/bobezatumeduxalakatotijo.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/4628111615.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/sutafefexisowitagukeno.pdfIn PDF document text
    • https://manenshop.com/upload/files/panuzugefi.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/melavuxulemituxawode.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/52697921501.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/famaveviletolenugudinite.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/76085102731.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/22701445010.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132817e31743---56499084430.pdfIn PDF document text
    • http://djapm.com/userfiles/file/88246725911.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/delekixodiremega.pdfIn PDF document text
    • http://artediapharma.com/upload/files/medopetefokazekoxonu.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/45294627797.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/wexinelegoxifewunofeki.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/45626154427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=never+have+i+ever+season+1+episode+1+full+episodePDF 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_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AE 18936 bytes
SHA-256: 6dc0ef58eeaaaa128454350c8d0d6aa60ceab12f8585db11f9bb476b0daf425f
font_02_sfnt_off000131a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A0 10692 bytes
SHA-256: ccd6fd90324533369fb68217ab28f74d0f9a4000f5a35d2511c3f15148c79132

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