Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb3975ba9cb2f03…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 06:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81d64b6fe3c57e28036ba580e8bd6ea7 SHA-1: 01b022df6d84f3e0246d763a06705208a2ec44b5 SHA-256: 8bb3975ba9cb2f0309e802f4de6833601de2e626f2977a761f569f471fa529ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable or unknown domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hstechno.com/userData/ebizro_board/file/zukizisazemuxejopo.pdf In PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/64434552229.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/rimaf.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/gubakirakojufenigi.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/rekejowulowawopijofejo.pdfIn PDF document text
    • https://webrobogo.hu/kepek/gibugotinuran.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/32905712302.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/fuxinepexavubutulamufu.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/52684406952.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/renuwiweguwivofumamiboj.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bamesaxifagisasasezud.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/pefotituxinulinudufedude.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/69816866974.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/91913433318.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/85072141437.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/getitivifed.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/60248914184.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/79803864586.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/96980256924.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/15235695063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=apps+for+android+nougatPDF 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_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 18056 bytes
SHA-256: f5b6c8882fcd2e95b6cee3b3a282d1137d28b424617165e6ccefb1485b171cb7
font_01_sfnt_off0001122a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 10576 bytes
SHA-256: 5347e9baef2dbc3dd9b2b650785b8cd3793f9c6f1cd5f4a94ae4b100470947ce

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