Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d763973fe0e6abb…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 06:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ed74c6acab35ebf88ec1e6ff3366d4e SHA-1: 91133ed0645ac76212f8f5270e6918551894b0f4 SHA-256: 4d763973fe0e6abbb078f672b28ba271ae80a8527cad0e05096ff71f33eab9d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=performance+mode+miui+12 PDF link annotation
    • http://www.cenlafilm.com/siteuploads/editorimg/file/rirenuka.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/73063606769.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/nelilug.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210907033523.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/zesegabavejom.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/nokasizufanubu.pdfIn PDF document text
    • http://portableandcool.com/files/files/63724284962.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/rimagixonop.pdfIn PDF document text
    • http://alkanboya.com/files/file///gibowegutavakagezuzuvota.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/nutapukiramegoraj.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/sugawozelirat.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424fa9ea8cd---88075626872.pdfIn PDF document text
    • https://korankertas.com/contents/files/22574822118.pdfIn PDF document text
    • http://rvhifi.cz/files/file/wuxevasiwukiviwifuzu.pdfIn PDF document text
    • https://ekransamara.ru/files/nazimuriribosutojone.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/43864874498.pdfIn PDF document text
    • http://dsfly.com/uploads/files/bovalolixonarex.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b2ccb6e1a---gubidokizifoxufixid.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/mimijosewakamijoja.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/47196323204.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/80083152357.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/vubazulasereze.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/wefivovafobog.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_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 20728 bytes
SHA-256: a19c4f6d60895656f554995c5b47c8ecff9764094eb41fd7d09f2a6cf52b3a07
font_01_sfnt_off00011446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 10600 bytes
SHA-256: 35175c68645e815f28383418b07e4bd6497899cc65dd4fa70ed4c68ed477b99c

Open this report in the interactive analyzer, or submit your own file for analysis.