Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93341d804074432…

MALICIOUS

PDF

72.3 KB Created: 2021-09-14 21:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e10f33c2531828b330e45a9e5a3572af SHA-1: 1c053a1e12cc866b928f48924b7ff5142d73f52e SHA-256: d93341d80407443219ab0b9e0d3e72b0f841032c570a07ae9d300b715b86d4a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites. The embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=poco+x3+nfc+vs+xiaomi+mi+note+10+lite PDF link annotation
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/51608126516.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/lubezamo.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/ruwawexumabusawubikajiz.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/96431991319.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/xexuretek.pdfIn PDF document text
    • http://weingut-suppan.at/files/nixuxoxoteripekagadefex.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/nukunobitebeluzasamaworub.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/jopexuz.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/89296021676.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4f26e685---balikal.pdfIn PDF document text
    • http://badgerhillfarm.uk/febolarafujerel.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/kakuluxidobef.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/xakelonogoxefobe.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/rinotezexajinumimedikumif.pdfIn PDF document text
    • http://arsvet.ru/img/upload/95153725439.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/97988308908.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/gawunuvetamo.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/gapaxunakamaluxuv.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/57837869729.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/takuxazegudizapapo.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/xodogifofavexewopemip.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/33103591171.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210911131408_1474381061.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/wetokepanog.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_off0000b951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD163 15952 bytes
SHA-256: 2aa7ca842fd8df8ca5f5b8424c3ae79f74e8e25298012f89ff6cc92f324a5776
font_02_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 10912 bytes
SHA-256: 5cf309d77feae4a3a02c85fc1bc4aa07e10c19826fc0a098c46c0c3e0a81f724

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