Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83e4ea0ea89b3eb…

MALICIOUS

PDF

107.4 KB Created: 2021-09-19 20:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0e75326e9c999ed74cf62da4213a194 SHA-1: c7bdbcbb63c1c2124db6417b5907725af294cdbf SHA-256: f83e4ea0ea89b3eba071ba133457ae90232ae2be8462b993cf72cd93ea460903
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 pointing to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=android+4+0+tv PDF link annotation
    • http://www.deopendeur.org/imgUser/file/80267894392.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/45002222275.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/62825cf0ab8408da9da4c24a7ff84919/75768230650.pdfIn PDF document text
    • https://kham.vn/userfiles/file/2901389358.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/82349842653.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/tizatiwufit.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/pagopavopojavapiga.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/ramigo.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/39574837726.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/20144445839.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/6240560538.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210911031935193.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/44221322720.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/95589763273.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/71637521693.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/48203142145.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/8152861687.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/napomufagigebibapis.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/gisokizafim.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/gurukozo.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/52703809038.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/sositopolaletokexowo.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/zepomod.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090708080565.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_off00013d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3B 9980 bytes
SHA-256: 4f65d75028dae946ce1632800d2d84ef9e727849a6d71124b327ab252c6f6c52
font_01_sfnt_off0001536e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1536E 20292 bytes
SHA-256: f81afc1a2d9a32f554f436d00735e466bd27fb1cdac12d6a3f03672c90db3be7
font_02_sfnt_off00018818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1