Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1ee1ba2ae780f6…

MALICIOUS

PDF

90.4 KB Created: 2021-03-12 05:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4658c0625f65c481414292d0e882c06 SHA-1: bfa76ecae7222e5f47de108fbee27c94e2928388 SHA-256: cf1ee1ba2ae780f647db761e5b022a478792868a8b3ca8f0c2e38ad82ca05503
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=belageddu+yara+mukava+mp4+song
    • https://static.s123-cdn-static.com/uploads/4456393/normal_600441ef8e4a2.pdf
    • http://tujukesabegakom.mygamesonline.org/28364355340.pdf
    • http://riwuvodobopexu.mywebcommunity.org/wikilukavitufakow.pdf
    • http://topukovatawosu.sportsontheweb.net/how_to_read_music_for_clarinet.pdf
    • http://finuxezanasa.mygamesonline.org/83893868232.pdf
    • https://cdn-cms.f-static.net/uploads/4462974/normal_6035e85064769.pdf
    • https://static.s123-cdn-static.com/uploads/4416150/normal_60084c2414ae7.pdf
    • http://jakesubinosol.scienceontheweb.net/greek_and_latin_roots_for_kids.pdf
    • http://lojapidabud.mypressonline.com/taxasurunebirinetofiz.pdf
    • http://xufelaketodo.getenjoyment.net/39437962174.pdf
    • https://cdn-cms.f-static.net/uploads/4481053/normal_5fd7f552072b0.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://faxiruvud.myartsonline.com/40260529865.pdf
    • https://s3.amazonaws.com/setikizo/bihar_si_syllabus_2019_in_english.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_ac59e902a9934439b0a94922da7dc8e6.pdf?index=true
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_a459ecb4dce2405d9e0cddc97001ed03.pdf?index=true
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_f9e15e559b024c36a453bfbfcacdb792.pdf?index=true
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_ebbf766e84964af6bc2a0859b89587fb.pdf?index=true
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_1ef735cddb69472eb5cefe2428e996db.pdf?index=true
    • https://s3.amazonaws.com/vifusupegiza/cidco_lottery_result_kharghar_ews.pdf
    • https://s3.amazonaws.com/wonumafubij/93585734871.pdf
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_b2a6f1be99314a1181594b18f01aeed6.pdf?index=true
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_56b91bf7b6c64a7f8a68c7c5301176bf.pdf?index=true
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_690dc7f42e6b401da744e227eed282a5.pdf?index=true
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_9b1cde79ff8b41f59967cd7970bcad1c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000109d1.bin
ef1058ce780a89a6fb098fe9d1293554bc00f961a5a43e79e12127db8c3085c5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x109D1 7212 bytes
font_00_sfnt_off0000f698.bin
a23f15c3cacb687e8e8f5ca145e6679c1ef7ac5b969ca54e1972933912a92e16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 5644 bytes
font_02_sfnt_off00011f20.bin
3af4216067e6999ad37bae81858816928e41493d2c5eb129b13fb937df5cc3d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 11668 bytes
font_03_sfnt_off00014695.bin
77d0e41b193f2956426f125f137c5665e22c2099967b8d3a504bff5b234847bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14695 16076 bytes

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