Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fe0c8f3abcc415…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 11:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8fb848053aca01436953afc07761acac SHA-1: 5f6ea8369d9c56088847568e2e5b6f5aeb4a6ad1 SHA-256: d8fe0c8f3abcc4153bed39ad05bb19470a55e9779aa9b349bc6a20ab875ac372
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

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://ketchas.ru/uplcv?utm_term=how+to+recover+deleted+mobile+no PDF link annotation
    • http://360global.ca/userfiles/file/9516462098.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/tuzediwesevo.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/lemebiniredosezogaxi.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/38671135146.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/10271208403.pdfIn PDF document text
    • http://gespk.com/userfiles/file/88473543795.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/1910829962.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091112294873499.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/25655605485.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/88920889897.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/lojabawefofamimegezu.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/40941462598.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/57153172771.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/widomebojo.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/lufaputofi.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/fataxe.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/75822208060.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/sekidupuxovi.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161427a65038a7---tazamofedulozekabelit.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/94746611547.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/74448479418.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613da81411e4e---pedas.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/79907811781.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/fupogojatuzisosemawis.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_off0000bc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4C 10484 bytes
SHA-256: 0a9a7db6076da6c3c8cad2c500a1adc98a37119491cd525a9df4abe9191bb33d
font_01_sfnt_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 15980 bytes
SHA-256: cef5bdc0fd2eb757d5c3e4ae7ed91f51f34442f8fa2419159def789df028707b

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