Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b19a90316dfcfb…

MALICIOUS

PDF

70.7 KB Created: 2021-09-08 18:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12a4620f95c404be49631574eca8547c SHA-1: 9c1fab9dcffe3cd8202bec730788e02b48bb2f8e SHA-256: 95b19a90316dfcfb627cc416a89b518b50b16ac7b11ec738ecdf43497526f153
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to host a collection of links to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311389132ba---lewozebutotiseso.pdf In PDF document text
    • http://hondasushi.com/uploads/files/bewefumuzaj.pdfIn PDF document text
    • https://novitas.ro/files/pijulubaredanesar.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/77955023939.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/gijafeja.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3ab1918f---xizalif.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/49362282930.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/sositasin.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/80781126149.pdfIn PDF document text
    • https://12tiga.com/contents/files/gebiguzovixosilateduxo.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/tezefaderipij.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090619584073499.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/31249582229.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/46899499792.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/tikolumidutixaxidateb.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/fegesivozekisifegatodol.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/gelutasetivomotuvanov.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/37878845711.pdfIn PDF document text
    • https://il-gusto.com/images/file/susaxujulubud.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/31652946649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=convertisseur+pdf+en+jpg+onlinePDF link annotation
    • 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_off0000b434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB434 10840 bytes
SHA-256: 502edc65daa3c8d45e5dcc0dddc4d9fa8d1434f989bdb32eb7bad75ffe39e7bc
font_01_sfnt_off0000cd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 15724 bytes
SHA-256: c8e47c7abf8124eff20874c3d9fa811b6c55b4aa580672acf0a3f55d970bf312

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