Malicious PDF — malware analysis report

Static analysis result for SHA-256 c528e54bc0cf5060…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 17:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 868fd0415d33cbf355f24a0add148040 SHA-1: b3e52ff7ef1d79da7d601e1d1929c5e49a5a8ffe SHA-256: c528e54bc0cf5060a6e9fa4d44691eab807484bf51c931d3a391a0245967c0c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to various domains, suggesting it functions as a link farm or redirector to potentially malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=kickin+it+gabby%27s+gold PDF link annotation
    • https://khotelmarket.com/FileData/ckfinder/files/20210907_808C34A86FE15764.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/45756007250.pdfIn PDF document text
    • https://empresa-venta.hr/files/84035125489.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/zuxexumidaner.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/34104752916.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/24423426368.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/jawetupo.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/newurajebawabazejezam.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf46dd498---sotikulufebevuroxewitob.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210906144804_734479336.pdfIn PDF document text
    • https://dacola.com/upload/files/29607360256.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/lerovabiweve.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/21267791334.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/repepakupebidikogazorusa.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/pumipogesudopalakaxuguvif.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/92864520114.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/55609770585.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/7121957315.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/5579019709.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/vemagivivajepufopala.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/napuxuresipojosove.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/kexuxexufugivonepumowu.pdfIn PDF document text
    • http://shahgrp.com/uploads/wowavugatubogasemisar.pdfIn PDF document text
    • 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_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 16532 bytes
SHA-256: 8554aa8106c5b56d322b17b7cf5c4045175094b82a944ec7f89f78bfb168207d
font_02_sfnt_off0001239b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 10684 bytes
SHA-256: 9551beff1a252e2a02c9a1946b52013c3e56e1a67c1f956f7608dd2d475cf354

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