Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac88f7c30bb4c2d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 08:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e77fc0fddeac4e1754cd50a0d5ae0d21 SHA-1: bac855a6ac7935407e14dda32c135bcb02a3a234 SHA-256: 7ac88f7c30bb4c2d1b75275923232beb13391c4ee2619cbb8a604b82de2f57a7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://st-ark.it/userfiles/files/sugesikijovavifumikumi.pdf In PDF document text
    • https://concurs-euclid.ro/upload/fck/65875593155.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/7867089321.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/41059295180.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/26461996619.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/badisufufib.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/majixemodefufa.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/lovupebagejiwum.pdfIn PDF document text
    • http://kasargod.net/uploads/file/25028070437.pdfIn PDF document text
    • https://susta.vn/userfiles/file/61903328221.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/45704734666.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210914_8B41DC72AD9B49D7.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/88927809705.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161350bf50431d---51486465395.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/28788484648.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210915_235102.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/bokunefijawet.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/43622376284.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/37705806379.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/774279704.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/46077690401.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1630566073.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/83032914002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+comic+books+download+pdfPDF 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_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 10976 bytes
SHA-256: 2880a59b0c803bb90d4573b77d2ba01e51f8ca527807739a7394eda5a261b403
font_02_sfnt_off0001170d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170D 17408 bytes
SHA-256: 294fcf526f46c6c2eae48ea2e8aa9cde5b8b31c47e44e23a62245073004cf460

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