Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacb30097450bbde…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 05:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ddb52c1f73ce06d0428500d63f8aeea3 SHA-1: e0bfeadb4450a81397fb8c36d9393cbb79351833 SHA-256: dacb30097450bbdea7cfb1a835eb315e21cbc9f7ae154909f88bc4751a82ac3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=things+in+the+house+vocabulary+pdf PDF link annotation
    • http://premiumcsp.com/uploads/files/fuxigegopo.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210911_013108.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/sovubevetopo.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/gegilikofakamuvalokemaxox.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7750999da---82586133859.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/73819382207.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/it8cfoevsav6r7661iqn696kg1/gevatexalulabuxitosowaw.pdfIn PDF document text
    • http://vitrine-prof.com/files/19079900731.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/kebilixobifugi.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/38461203383.pdfIn PDF document text
    • https://diphong.com/uploads/85218725688.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/tapepu.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/visexewosabobo.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/gelekivoxa.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/muxijorovaderitidizivo.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/36103647495.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/kabisipazijodoxidel.pdfIn PDF document text
    • http://snft.ro/media/file/jidadako.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/17467774968.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/tonerukusaxekuxibiwaruli.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/48427994875.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/rilerurol.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_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 16492 bytes
SHA-256: 6318d39aafd652ef259e09b1652d2ed1652df28bdf5dafd483419f84958b2886
font_01_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 11284 bytes
SHA-256: fccbf1587537dae488900abdfea5e896afdc5c03108e8cdd0703f2813e84a674
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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