Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dffdc7c1984699…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 14:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e35aa9b87e437b2349f10bf6ed35d9a SHA-1: 60fc50ffc30e0516689eb13ee23b0401a90fbe9b SHA-256: a6dffdc7c19846998e8a04342e8ba6d5754ce12eb0d5ee2fb2b99a157b1cdcbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, aligning with spearphishing tactics.

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://inwebjor.ru/uplcv?utm_term=dragon+ball+z+strongest+warrior+apk PDF link annotation
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/xasojepu.pdfIn PDF document text
    • http://a899.net/userfiles/file/jilelibuvojukuwogepa.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316b1aa58ea---20544198782.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/79285953136.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/verufotisewepusiso.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0a1ba3eb---96019760632.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/debedokujiwufidurunizaru.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/nivogipifexes.pdfIn PDF document text
    • https://medtek.vn/storage/file/84469120947.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109171934494929.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/miwofawagitukaxawaxu.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/12784733363.pdfIn PDF document text
    • http://songchanraccomposite.com/upload/files/29345785164.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/87205478578.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/qp8a2q9mihd6tohcvl1see6h3m/bofivuzovabivagunudak.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/97373389695.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/1274201770.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/88804038513.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/85808904038.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/81559890800.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/4795268712.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_off0000ac1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1E 10808 bytes
SHA-256: 2ff3d59bfb4a5c19aef1051a4f6335a2bf509cf38959bdbb3dd3d73fc7305fcc
font_01_sfnt_off0000c507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 15368 bytes
SHA-256: be26d30f2460d1a89bd107d2042f03a467b1edba3cb2b145c00af312aa0d1dfa

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