Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bafb624d6f5bd9…

MALICIOUS

PDF

75.3 KB Created: 2021-05-21 17:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b8d312aa8b1deba8592edc468c809e69 SHA-1: 2f0c05fd9423bfdf915ab232548af988cd6a30c0 SHA-256: 52bafb624d6f5bd95432a6e396e970ab4807b8e934f885ee250df3309c6369c8
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically identified as a lure for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a network of disposable sites designed to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://baarspo.ru/strik?utm_term=naming+ionic+and+covalent+compounds+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467612/normal_6021cdd21b135.pdfIn PDF document text
    • https://womolikusewafok.weebly.com/uploads/1/3/0/9/130969044/1989938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_6030177dccba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_6069fc5a97282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403541/normal_5fe02db8c425e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444623/normal_6000f6af97aeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420470/normal_5fdc06deb8ac7.pdfIn PDF document text
    • https://zodukaveg.weebly.com/uploads/1/3/5/3/135345947/menorozazowu-vawisijapupeg-vutibixik-liset.pdfIn PDF document text
    • https://lunogowome.weebly.com/uploads/1/3/4/8/134859941/bozelitofupaz_wisozuved_mebiwevujavus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366029/normal_5ff8f8d8427a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_605955dec6da6.pdfIn PDF document text
    • https://dadanesikukuno.weebly.com/uploads/1/3/1/4/131438481/xisow-xuxizomofum-domadafijajuwe-dixatoxux.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/b9f70e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_6038050b427d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415321/normal_6059b479b9117.pdfIn PDF document text
    • https://noremovex.weebly.com/uploads/1/3/4/8/134883944/sudizixiza_raviredumev_janaligibise.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383138/normal_5ff92f16bffbb.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/nojemi/letter_m_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/81700939048.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/64939559899.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/86394808871.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_off0000e84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 5776 bytes
SHA-256: 0319358e517bccc6333153c3a38f77991aeb438a9899464ed45c2a90b3c93641
font_01_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 10228 bytes
SHA-256: 0a73e984373969ae08e4d38fbfcbb6cddc119e3d412976703d90e40933816114

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