Malicious PDF — malware analysis report

Static analysis result for SHA-256 643bc6c74243dfff…

MALICIOUS

PDF

84.3 KB Created: 2021-03-09 04:06:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5dfb908812a92ea5ce3f1e8f478de99d SHA-1: 10fcb713b0bc99001b5f0b180d2de6cf086b78e6 SHA-256: 643bc6c74243dfff8a225f5ebeac1374520f32c786c51c20ac35d34e7b3ec81c
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document's primary purpose is to trick users into installing a malicious browser extension or update. While no scripts were explicitly extracted, the presence of numerous external URLs, including one pointing to 'golowaki.ru', suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://golowaki.ru/123?utm_term=how+to+format+react+code+in+vscode PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501495/normal_600e9c81e4cc2.pdfIn PDF document text
    • http://teenagetutor.net/sponsor_letter_for_uk_spouse_visa_templatei59sl.pdfIn PDF document text
    • http://gebojiwikidavu.iblogger.org/identifying_bottlenecks_in_informatica.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474471/normal_5fde50e33fb64.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/8250702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493549/normal_603a818334670.pdfIn PDF document text
    • http://gotuxeloso.22web.org/88664581624.pdfIn PDF document text
    • http://yozi.store/stained_glass_window_project_algebra_25eic2.pdfIn PDF document text
    • http://3gusevshop.website/cisco_introduction_to_networks_notes9pwyn.pdfIn PDF document text
    • http://fowuwoxex.iblogger.org/wefovelegogowugadelovaxal.pdfIn PDF document text
    • http://islandlandscapesbb.com/volume_of_pyramid_worksheet_tesg88se.pdfIn PDF document text
    • https://pojewesam.weebly.com/uploads/1/3/1/4/131410485/5566009.pdfIn PDF document text
    • http://fisuruwibowin.66ghz.com/muxirakataxogoxuninad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373259/normal_5fed01b62b5fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5ff63107381af.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_dd5fd6a6924447209fd7bd4d7ee1bd93.pdf?index=trueIn PDF document text
    • http://janaxoz.epizy.com/how_are_you_doing_today_yahoo_answers.pdfIn PDF document text
    • http://ripapekum.epizy.com/trig_identities_list.pdfIn PDF document text
    • http://nitusul.rf.gd/boy_scout_class_a_uniform_badge_placement.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_3ef69f8ce3474e37a31d121df6d59bb8.pdf?index=trueIn PDF document text
    • http://ludesol.rf.gd/ayurvedic_upchar_in_marathi.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_986555e0b56a4996be056d482c54fd38.pdf?index=trueIn PDF document text
    • http://gejujebiwibi.epizy.com/domain_driven_design_book.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_513e859157ac4abc9a0165827949b642.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_630fbed010ef4a51b832c0c4016c0eea.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 1712 bytes
SHA-256: 7abc62017bb4f813cd360d317de88688a1b65b70251888cc759d91e4187ca266
font_01_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 5248 bytes
SHA-256: 61276b36bacc307dc8585067b5d8a98a2de04643cabbc9c4efc788b27591f25a
font_02_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 11236 bytes
SHA-256: b55dbcd8df6bfa5d1a9805f344c0d4c2cdb024dc300a44fd4730fbf8422bb654
font_03_sfnt_off00012c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8F 16380 bytes
SHA-256: 9ed6abad90a7c2447b92c591a5a6ad3ed20d695d0bc71b8abe90eb48c15cb95b

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