Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cd4fa88eb422c9…

MALICIOUS

PDF

98.8 KB Created: 2021-10-07 23:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0dbe0650c67708f001cd1ed76a1b4a3b SHA-1: 90d6278b8289325108af955ae178dd1ba98e093d SHA-256: 98cd4fa88eb422c93a27f1e3ceae97f8ea63bb0bf66dd2edfae37f514b99a49e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, including one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure and embedded links indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=environmental+science+books+free+download+pdf PDF link annotation
    • http://newo.ru/files/files/85672627961.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/dibutefonavoxe.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/99106231180.pdfIn PDF document text
    • http://parfumland.sk/upl/43646036573.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/jojidojenop.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/lodafinupawigizimipojore.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/vixitovi.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/26815150739.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/mijufopusapudugugifunik.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/ludiwifem.pdfIn PDF document text
    • http://fullx.net/files/bikifusite.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/sabotozazin.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/kufovamin.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/32717880849.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/79057563761.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/31200758038.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/zulugaxin.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/weranepobikaz.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/87601271624.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615425f14ada1---fobugipixaxelevijigux.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/60697117947.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/towuvazelibetig.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/pekovuponimezerebagigozut.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_off00011316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11316 21540 bytes
SHA-256: e83af93510c0d31b80973befc5faaa7669b88600ea65130452dcf33c6dae9417
font_01_sfnt_off00014b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B00 11148 bytes
SHA-256: 4e4e6f4931914e2d324ffb8b4441273679aad5532b49ae91fe8278ef6ba52ad8
font_02_sfnt_off000164ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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