Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd15afd3ba3d50cb…

MALICIOUS

PDF

85.1 KB Created: 2021-09-11 08:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29273ba3cb311db1320758b474e5de49 SHA-1: 966915c4d22fb2f17eab266fc89cad9ea6a742e5 SHA-256: cd15afd3ba3d50cb88584bd0370e914cf7ba1070303540ff136bc2cad1d53176
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via SEO poisoning. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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 http://ranchobg.com/img/file/lomogunaxawimojir.pdf In PDF document text
    • http://geose.ru/userfiles/file/suguluredarinutaxuxava.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd6eb6238---66809608680.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/56763234190.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/fidevukom.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/vikazibet.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/kipive.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/wofemizezowatar.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/42521906197.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/66335652625.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/fuxitonofazoteluruxutalen.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/156203440.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133094f87b86---woriwuwonot.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/59823647943.pdfIn PDF document text
    • http://wmsone.com/eimages/file/darulobu.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/jivatokerapujiga.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/42163681415.pdfIn PDF document text
    • https://ienter.bg/files/83680846692.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/27698948764.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wowawozaduzoxojerosora.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/90442689516.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/99952461086.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/vudug.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/mipevuxuxo.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/95213248844.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/28141499771.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/75061397849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=vampire+diaries+season+2+episode+18+watch+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_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 11212 bytes
SHA-256: 260f2d71b023262175141c52829e5371c20c1609e9983e044762e75297098153
font_02_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 18144 bytes
SHA-256: 0b43c2e7438da0278ca698e99e9cdddcd3aca84271ea3289901475f0ca8beba9