Malicious PDF — malware analysis report

Static analysis result for SHA-256 211657b839f73923…

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 19:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 002092397b90aa06970d53b01e16cafa SHA-1: 93b4afe96353c4dda138617d28c3aa7e1008e299 SHA-256: 211657b839f7392303a7521f3aae8d6e44890e9ca25a3c74654780b8efb510c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The PDF structure and the presence of external URIs indicate an attempt to lead the user to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=react+native+android+sdk+29 PDF link annotation
    • http://suaups.net/userfiles/file/40423603575.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/rikefufavamakaxedavebipu.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/wenaza.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/sijakanutosixelaw.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/52357580254.pdfIn PDF document text
    • http://egitara.com/upfiles/files/jisudubibapeganiv.pdfIn PDF document text
    • http://dalaichau.com/files/sutarajarabigixat.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/41151217063.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/nidevimadafajujenerunuxa.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/sogapila.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///rolokirimomenuranejopuguj.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4d79798a7---pujabipotitewasuketilipi.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/biwuburupof.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f790a258a55548ac69e428bce259c9bb/nonitem.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109200716371532.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/jataxowufirokogiz.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/zuxorim.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/gupugixizominolobepezef.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/jewodarofutov.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/xijevos.pdfIn PDF document text
    • http://orem.mn/uploads/files/69364856012.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/xosesoxe.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_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 10808 bytes
SHA-256: 9b55e9de0fe7c1fc540a1ba03804baad56e1260aafd604152e7099835789afc6
font_01_sfnt_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 17760 bytes
SHA-256: c556f36fd235485271bf09ce8264b30a70193886b1de27f6e748585a79d9698b
font_02_sfnt_off00011b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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