Malicious PDF — malware analysis report

Static analysis result for SHA-256 70567ab923095c14…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 03:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d4565e521feaffd9224526f1ffc1444c SHA-1: 7fb903f03bfa588a677f9734028ae6ce7b22680a SHA-256: 70567ab923095c14feaefff80695ce111472943effba0e57b24b47599fea6959
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 hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on low-reputation domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=how+to+record+your+android+screen+on+pc PDF link annotation
    • http://smenergy.kr/uploaded/file/1638797441612f3e01e040f.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109120755079392.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/xorilikegedexedemuvo.pdfIn PDF document text
    • http://domainecomps.com/documents/files/72220899172.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/xewopururigejesexaxulim.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161424e7445c1c---zajenisoxub.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/mapukexisizajujuf.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/jobavibasupidotonidi.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/zimokuralelivotel.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/94114244436.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/90453770573.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/gopibovufozi.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/zesekatomo.pdfIn PDF document text
    • http://allycatering.com/userfiles/tejimidofu.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/17134425335.pdfIn PDF document text
    • http://marymo.ru/uploads/files/zirexitizovasitopibazan.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/59008678610.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/barelomapevawux.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/2825287896.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///zarepapipuwemu.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/nevilovitududupiwo.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/wamojetosixefidutixexawit.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/5031544698.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_off0000d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 10752 bytes
SHA-256: ff9a92200d5d679fddbb26cb55f743dbfa0c57e610dd4da4a24dce0b39632fcb
font_02_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 17900 bytes
SHA-256: 77a37fa4a6d617c829d2218681b87ebfeb2e318736e9e2b3547516a46b66ac73

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