Malicious PDF — malware analysis report

Static analysis result for SHA-256 238cb93c0ad6b248…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 10:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fcca44a9539e395b093ccee35a06d9d SHA-1: bbda05ec302ef49fe2c5e652764a507bedd7486d SHA-256: 238cb93c0ad6b248617089f1a925111f00175c5ac2da43b6a56d40e3259f1215
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing. The embedded JavaScript, though not fully detailed, is a common vector for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=square+fit+apk PDF link annotation
    • https://khogiaydantuonghanquoc.com/images/news/file/sutapixivipod.pdfIn PDF document text
    • http://hocomesun.com/upload/pimepiriz.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/14041749652.pdfIn PDF document text
    • http://toroisg.com/public/images/files/datuzevomudop.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/marumizigigu.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/51922013410.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/47752969076.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/fawokunotigamobirar.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/28351435008.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/82487657303.pdfIn PDF document text
    • https://buka.ru/sadm_files/9876299792.pdfIn PDF document text
    • http://firesystem.ro/imagini_ws/tolijedoweloji.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/53271678038.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/bominusoroduxitiratuxu.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/87414293457.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/zusunoxexojifodegexuzi.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/dunenabofe.pdfIn PDF document text
    • http://turatabor.hu/media/daxezijevaxazebibo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8ec6817870c291d1c5ae4b4a99eb802d/mumuxeneril.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca0f38365b---28877112551.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/migoxozunebezezonuximusaw.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/21205751591.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/28524608317.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/59220260443.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_off0000c3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CF 18168 bytes
SHA-256: 3bdc02e3352ea46fce55dcc141600f959441afbbd162a450bf9d7a3e82e760a8
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 10324 bytes
SHA-256: 3e90defe1ec9147a4f4aa96865294dedab51930373b79d91b298e66d84549009

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