Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fe6fab507055f0…

MALICIOUS

PDF

77.2 KB Created: 2021-04-06 03:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8002bafa79806d5d9e11efe426e9d524 SHA-1: 136727a8d905965afa999fbaf64ad3a86763571c SHA-256: 21fe6fab507055f017efb12c33289e4e8e1e21a15200ca4e42c5432b04551d08
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is identified as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a lure related to 'Nextcloud install guide ubuntu'. The presence of external URIs indicates an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/aws?utm_term=nextcloud+install+guide+ubuntu
    • https://cdn-cms.f-static.net/uploads/4454043/normal_6015194042fd1.pdf
    • http://arnautmebel.ru/58970789644g0a30.pdf
    • http://microbladingcertificationdfw.org/17497338950fbm3l.pdf
    • https://cdn.sqhk.co/bebetirifam/jc2ggT6/natekaliz.pdf
    • https://cdn-cms.f-static.net/uploads/4478685/normal_600c7e1628745.pdf
    • http://rollernefrit.xyz/best_answer_for_are_you_a_virgintb22n.pdf
    • https://cdn.sqhk.co/rufopunuk/jfiegcb/digicel_recharge_online_fiji.pdf
    • https://cdn.sqhk.co/vebiziwob/gggfxhi/nokebilif.pdf
    • https://cdn.sqhk.co/jagibuvat/iboihjf/45090594387.pdf
    • https://cdn.sqhk.co/ludukuni/hcJgdFf/35323293655.pdf
    • http://onlinesos.tech/maxenupotapekaocq.pdf
    • https://cdn.sqhk.co/mewivupa/ejjjbij/tasatixofenelimoviwip.pdf
    • https://cdn.sqhk.co/kewixoretuze/iciihjT/speedy_cash_online_customer_service.pdf
    • http://load-bcp.com/how_to_use_bob_revolution_strollerho9yh.pdf
    • https://cdn.sqhk.co/fosuzonarefi/hbXvjjN/13286879039.pdf
    • https://cdn-cms.f-static.net/uploads/4461761/normal_605fd887ac467.pdf
    • https://cdn.sqhk.co/titabofasika/gdvheae/37776359717.pdf
    • https://cdn.sqhk.co/nulaliki/6VOgeie/52922759122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_de7e5ba7b20a4ac3994dc0d35edf5935.pdf?index=true
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_6b5cdcd440964ac19d3dde5804a1dfe1.pdf?index=true
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_0197e4be62aa4538bb50351d6bf54111.pdf?index=true
    • http://fosadexovoz.epizy.com/725571162.pdf
    • http://mekamaxabojumoz.epizy.com/mathematics_statistics_grade_11.pdf
    • http://gesozep.rf.gd/wuzeniwok.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec94.bin
80e106c362c956bb25bbff003a6f6151af0474d7eaf14a71ca68f23a9cea68d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 5188 bytes
font_01_sfnt_off0000fe54.bin
2eedcb53670cefa3d03c174ef318ef3de17170fc6bb719b5735f61c1acc7c578		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 12024 bytes

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