Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0dbcee411e8411d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 22:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8679ba8f0f1928e71cae3985fe8c48b SHA-1: 9f75c0d1afd0ba2877e6bf66bca925b91c678015 SHA-256: d0dbcee411e8411dd3bc22d730d1f1faf0238ddd91d6cf5214dd75eb7c97e9cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, suggesting the document's primary purpose is to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=vsco+apk+free+download PDF link annotation
    • http://polaryachts.com/res/wysiwyg/file/49591849192.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fa9caa66801a50bedd3d889bf51cc847/lonives.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/sowixidalepafumil.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/23183565743.pdfIn PDF document text
    • https://anjingliar.com/contents/files/titonid.pdfIn PDF document text
    • http://scsychem.com/upload/files/fuvixakorivure.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/xilutenosolevekixazubik.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/28677389057.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/zakifewuburozenujojitufes.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/fusanupozix.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/mixiboda.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/96822889920.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/notodulamogoketiwujeza.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/69764142948.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/22462355249.pdfIn PDF document text
    • http://honghuibio.com/d/files/78020139885.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613142ed11de2---bofazaxuvabenuxulodiweju.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/mimobagadanedu.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/rawujilotaxifufivofara.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/82480310641.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/golozokit.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_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 18068 bytes
SHA-256: 11801330b5945d3fa0abca632f61fbb8c955412321120be5452a4eecbd7d6b6d
font_02_sfnt_off00012e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E80 10572 bytes
SHA-256: 29191d9418f3fdfef184251fed224ca95da22a8c330fdc4687db0df9c4c39940

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