Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9178918a590cc02…

MALICIOUS

PDF

75.5 KB Created: 2021-09-10 11:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af1a2e04ec6916ad1cd7471407230ba9 SHA-1: f92dc187fb9aac592f10583914ea8003ac382e96 SHA-256: b9178918a590cc0236697c98fa37c5da74f9be5aa066ffab1f846922e641ce0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of embedded URLs suggest the document is designed to redirect users to potentially harmful websites. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://martas.vodrsport.cz/uploads/files/fipigajivugiravudafev.pdf In PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/6638003481.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/68623852757.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/7125048313.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fd8e06064d4aa4566ad88dd243fc4348/99636240684.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/pusizexa.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/52893105282.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bisosis.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210910025454.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/jeretesesemodibigixofite.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/93665372604.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c0f405ba---juxemunuguweragorexox.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zajajeroxizezoroku.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/xoponuz.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/84588870616.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631060911.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/78833792914.pdfIn PDF document text
    • http://primaneighbors.com/userimages/89282786522.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/7371493034.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/fetivivufexeva.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/75533359406.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138c49dd5f51---41004620414.pdfIn PDF document text
    • https://anandalaya.in/resources/file/85802797316.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/64306843166.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/zogeladenanefepowot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pes+2014+apk+android+downloadPDF 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_off0000c2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E5 10836 bytes
SHA-256: 8b12da840e75225da185fcdfeb871c4f00b2c12142402a68b7b845a4f2e9e1af
font_01_sfnt_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 17272 bytes
SHA-256: ce8543839083b3cd340e8690d8ee367d8e9f7f87bda61b6f690875bd94a0ed33