Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb526b281ba5dcd0…

MALICIOUS

PDF

74.6 KB Created: 2021-09-12 02:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 11d9cca1f0a982ef2f7d2e4c8938538b SHA-1: f686a59fd6c63e3fc6bf576f225dbf37baf5e15d SHA-256: bb526b281ba5dcd0258f04f02cbe77747ec7662ab78bec7595a9a9e779f1b6a9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, including one that explicitly mentions 'battle+cats+download+hack', suggesting a lure for users seeking game cheats. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://catamma.ru/uplcv?utm_term=battle+cats+download+hack PDF link annotation
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab334cd4f7---7341773045.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/69519760506.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/dejep.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/jupufewavibuzasatebe.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/zuxozisinopumar.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/86070677145.pdfIn PDF document text
    • http://short-story.ru/upload/file/lokonorowavemanavubabumev.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/nedekajemariresate.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/18500080675.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/dibezuzisowosedekutedin.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/94272152646.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/41512977118.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/nebutinakok.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/14370200322.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/e7q7i576nuounrgi8cibhe6s33/65408112993.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/46481199248.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///vogabonej.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/jetuvagibaxogerodet.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/5308424548.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/72799967870.pdfIn PDF document text
    • http://www.siposferenc.hu/html/34813265215.pdfIn PDF document text
    • https://laps.pl/userfiles/file/42481977981.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/54843803235.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_off0000bea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 10504 bytes
SHA-256: 3bbc4f0b82d2e95454b0a7e1a6b96a939b0dea50ab3d2090d823637f843e4f2d
font_02_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 17824 bytes
SHA-256: e0927cf4f8ef31239387631237e2eecd35945b41fc558f94bf0df82cbd96f787