Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a7644791244531…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 14:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4055e1a7e4910f439b2ca2c02722151e SHA-1: 96d9281d474c2b5d49685db3a22a5a4aa02e43c9 SHA-256: f6a76447912445318f0226d8ebe9144001aab2bde2ee7b41a72d33b066e4fc81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable hosting and are likely used to distribute malicious content or conduct phishing attacks. The presence of these links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=emulador+android+para+pc+instalar+whatsapp PDF link annotation
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/43842491628.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/49583837077.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135e76da3d58---90081870109.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/jokanurowirelub.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/xukotesubisop.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/47952209659.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/saxinenidumu.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/99505788227.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/dodekatepuxikenatomaxa.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210902132520696564ra6rpw7wi87y.pdfIn PDF document text
    • http://grafitym.kz/files/file/sidorigijekexovupa.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/24605144483.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/17266782429.pdfIn PDF document text
    • https://network-italia.com/file/35099802414.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/63809080007.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/tebezamusoto.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/05220356247.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/93076102254.pdfIn PDF document text
    • https://cubic.is/userfiles/file/fufomotabifuvaf.pdfIn PDF document text
    • http://hanauhrova.cz/files/doxunasuvexukujumutob.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/kezekazigi.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/tuvenafegasuni.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d91f7bc8b---13470765318.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/62861594882.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/dadebipefunasizim.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_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 17300 bytes
SHA-256: 388088ee14891ad6b5f9f5d7a2301aa6ddb1c48e84453cc62860140824d05b2f
font_01_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEF 10816 bytes
SHA-256: 8dc3799975b1c65a0f147883046b4dabc7f0d330997b3c38cce7ab2915f1bb5b

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