Malicious PDF — malware analysis report

Static analysis result for SHA-256 0763979e239607c1…

MALICIOUS

PDF

94.1 KB Created: 2020-12-27 07:21:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6f0d6771d844f16d94df01ce239af5b SHA-1: d3bf75a69dbd2e6f87374101817f2dc590175a45 SHA-256: 0763979e239607c127e738339d17584b8d126674274951395f0234b5f18b8a57
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, suggesting a link farm or SEO poisoning attempt. One of the primary external links, 'https://traffset.ru/123?utm_term=jung+jaehyun+birthday', is flagged as unknown reputation and is likely the intended malicious destination. The ClamAV detection and ML classifier strongly indicate maliciousness, pointing towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffset.ru/123?utm_term=jung+jaehyun+birthday
    • https://cdn-cms.f-static.net/uploads/4392441/normal_5fa5a32f49ebd.pdf
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/f984f119c8a.pdf
    • https://cdn.sqhk.co/luvuxokam/jwhfmWM/cheap_contacts_online_acuvue_oasys_for_astigmatism.pdf
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/gikinigudatubelag.pdf
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/a3e8e444.pdf
    • https://kofijowuz.weebly.com/uploads/1/3/4/4/134446653/xomavak.pdf
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/40a5e5.pdf
    • https://cdn.sqhk.co/fejavegiwo/igjjKM5/nexage.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/degagaziv/kansai_nerolac_annual_report_2015-_16.pdf
    • https://uploads.strikinglycdn.com/files/96f9a604-6ef9-444a-b40f-199ab5aa5098/bozetam.pdf
    • https://s3.amazonaws.com/fupanabivote/mizaj.pdf
    • https://uploads.strikinglycdn.com/files/e5cc2c01-e1e9-4aaf-af36-ef5848d3f538/ronolu.pdf
    • https://s3.amazonaws.com/gujutavevive/torrent_the_dark_knight_rises.pdf
    • https://s3.amazonaws.com/tetenifeme/the_lies_that_bind_rethinking_identity.pdf
    • https://s3.amazonaws.com/kizugokofo/business_administration_books.pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d8.bin
9155dfac47bad000515f429c170c7fba8a8dc4a566af08fa78948960ef3a742f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 6660 bytes
font_01_sfnt_off00010c5f.bin
1cab8424a0d9c2e7b29afd59caaf3da62b339a3993e203f95e38a6748e6e1257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 5184 bytes
font_02_sfnt_off00011dfb.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 1800 bytes
font_03_sfnt_off00012688.bin
cb0f8c1880737366575575cd3ea664e65af4addf64ef15f712132b113cde7f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12688 11796 bytes
font_04_sfnt_off00014f35.bin
5a19406ec415c5e1f3a070714044ebfdd80c783add8ee1239a1cbe4d00e50cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F35 18088 bytes

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