Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd17217e919c572…

MALICIOUS

PDF

109.1 KB Created: 2021-03-19 06:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2d09c0fcd1ba281055e2990a1ba4eba5 SHA-1: fbf1516060a9134b85c63cbc97436684ff3f8529 SHA-256: 4fd17217e919c57269ac34968fdc8884f7edce5bf45830ed05c8daf446c1b14f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' suggesting a large number of outbound links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/123?utm_term=bay+primary+school+bridlington+ofsted+report PDF link annotation
    • http://form-lnstagramverifiedbadges.com/pezumutagisapisowunetisusl3bwd.pdfIn PDF document text
    • http://mon-cmbretagne.com/kokutabivijipevevna441.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/jSkhjgd/swot_analysis_for_students_example.pdfIn PDF document text
    • http://kupivse.xyz/cardan_jointe47nc.pdfIn PDF document text
    • http://carinsusa.info/strength_training_at_home_without_equipment_redditosh0x.pdfIn PDF document text
    • https://cdn.sqhk.co/lodoseduler/RZFE6MC/eso_death_knight_leveling_build.pdfIn PDF document text
    • http://blockingscenery.com/16674061301imo8m.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/id7cT5h/whatsapp_y_messenger_rooms.pdfIn PDF document text
    • https://cdn.sqhk.co/bamopilu/jhigEfP/ffiec_cybersecurity_assessment_tool_excel_spreadsheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jevelel/exterior_angles_of_a_triangle_worksheet_4.pdfIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_4eacda4e7ba241db889fae979fd18a73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nokiva/44811720023.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/mozilla_firefox_browser_version_below_42._0.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/kulukilabasezit.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_82208920626c489caba0d8de1f74de1a.pdf?index=trueIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_c73ce200fa4f4289a7cebb461b72305c.pdf?index=trueIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_308365f4b7d34f8395a0cd8f823f881c.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_c522f577c042479393c233289f9e9fa5.pdf?index=trueIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_3ea70595c1ff483c97c1e796237dfb1c.pdf?index=trueIn PDF document text
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_1502c80c1d88450c8fde633d0bbca7c2.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_7233125424b24c3da3a7889a6b4d5a0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/easy_guitar_notes_for_bollywood_songs.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000163f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F2 5860 bytes
SHA-256: 138eaf0fbe7913a30dc21f52280836d5d3e6bfa947706f55b7afa5e385bed399
font_01_sfnt_off000177c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177C4 14160 bytes
SHA-256: daa84ba14eca17d825438e7ae643b1c3f979c41aa8622bcc9be83ab8cf59aa9c

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