Malicious PDF — malware analysis report

Static analysis result for SHA-256 2018bb4c4cc97029…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 17:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7899c4e273566da7ae517a2ff6b5ae25 SHA-1: 2ccd01991878fe86068b1317d8c167f218e647e4 SHA-256: 2018bb4c4cc97029a699dbc45a88b74d2b9d902264be7c9e61dc8c6da80680ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to unknown domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://www.sctiec.com/up_files/FCK/file/wuwotiligadam.pdf In PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/57044303789.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/ralof.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/15884467108.pdfIn PDF document text
    • http://clickvay.com/upload/files/nolimidegumok.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/tomiwojasalutowo.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210906_010534.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f263860fd0---xurutibixagakatosiduniw.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/22538440107.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/xedoxozibuxe.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/18297489694.pdfIn PDF document text
    • http://altus.pl/userfiles/file/kiseruwawekawozegujatifir.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/7673594255.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/gafodotuperufaro.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/20979155347.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/45675819495.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210902174656.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210902030423_rlxhe7.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/zumanisasalaso.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210905225145.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137f8d3e9e80---58061433905.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/dejubebo.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/xuvofapobidugebeful.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/37134209243.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/20565396296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=role+of+social+worker+in+hospital+setting+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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 11124 bytes
SHA-256: b8c4a701e3310a7522102d59f82d4d5a7db66b38dac704892327faf9ba74fd8d
font_02_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 16900 bytes
SHA-256: 7df68fb9adc8b5b938154e36667b62aa3b6989310015e6135859d4b2dcb7f723

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