Malicious PDF — malware analysis report

Static analysis result for SHA-256 732b3bb40643d41f…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 04:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5530589f5a56fc0ed6092e9951dec3e2 SHA-1: 3cba82f51d360cf749c51b1e8c1ac7ea1475310c SHA-256: 732b3bb40643d41f4096cfc0d814a80befed0cd0b81dc3cb49907cfc475f8427
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host a large number of links on disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially harmful content or exploit SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://tai-yang.tw/taiyang/upload/file/44014616009.pdf In PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161376e9248b02---7850015297.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210912_ADE9F7AA45DE945C.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/89572040245.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/mobelulava.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/92752582696.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/23055815438.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/41677959686.pdfIn PDF document text
    • https://unaizahic.com/Files/files/12102005429.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/45174456047.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/78095829783.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/23338370123.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/28482571022.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/kugum.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/wokezadeximuxorekepesaru.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/44073676917.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/nujupage.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/94717045805.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/41621646601.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/32852615302.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/fokojupo.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/wunafovasasoxofodanebuxe.pdfIn PDF document text
    • https://robodom.si/files_vsebine/vusozeripikutiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=payback+2+hack+mod+apkPDF 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_off0000c1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B7 17700 bytes
SHA-256: c31e4a58c24e7d7b3dcbaf70e6d7007fb90d83e158865f23ab18d8627ae85728
font_01_sfnt_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 10508 bytes
SHA-256: c254ec1909f83e97151df971daf8a2a9b93a2ea8bcbab4887b1366a5a97ed907
font_02_sfnt_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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