Malicious PDF — malware analysis report

Static analysis result for SHA-256 8775e4ecc84428ef…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 10:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c63b73d931fad1c681abbe6812d8f3f4 SHA-1: 6bf184b77ebd33b27654bdb56823a9713a7bcab9 SHA-256: 8775e4ecc84428ef9f5df83964c508a23bc84972a4d368ee695d529920dbfb0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high concentration of links pointing to domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of external URIs and the structure suggest a spearphishing attachment designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mamalight.net/business_school/uploads/file/3177590558.pdf In PDF document text
    • http://lovesenergy.com/file/16269720314.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/41677959686.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/71018361062.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/68219907769.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/67163832651.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/vujofimim.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/lemegoravilafonone.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/61618774634.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/22916616661.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/51714716822.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/46361847981.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/kalafojanodamefilebo.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/xaromamop.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/78879343404.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/92916172293.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/bufilatilefola.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/32064975910.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/15046286030.pdfIn PDF document text
    • https://clubon.top/uploads/files/datojixasi.pdfIn PDF document text
    • http://apicn.net/upload/files/18089003712.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/zetufebozixix.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/vosililitepaxalif.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139931ed4f9f---37796124484.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/80671358956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=acute+hatsune+mikuPDF 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_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 10404 bytes
SHA-256: 830b03ca01c02f55be9cb272e08303055e077ac4768f586b56c827f55dcad2c1
font_01_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 22760 bytes
SHA-256: da43ccbd8524739858bba73e08482b39a6a707f4afb3754f9f84f2b204a85beb

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