Malicious PDF — malware analysis report

Static analysis result for SHA-256 04cd43b1c869afea…

MALICIOUS

PDF

79.1 KB Created: 2021-06-14 02:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bb376db887962e11f7b0ed30a86fee4c SHA-1: b0f069c5f254b11d2679ef00be1cd5d6b9aae0c9 SHA-256: 04cd43b1c869afea5a741c418acc23969a60533abd129c94faa9b0821cc9488a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://leonvi.ru/123?utm_term=symbolism+in+poetry+worksheet+pdf PDF link annotation
    • https://lipixikipated.weebly.com/uploads/1/3/0/7/130776445/4580921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_604368e57e700.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4487382/normal_60b23cab5d8ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_6023ded87c97b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_6009f68322623.pdfIn PDF document text
    • https://labuxodapiju.weebly.com/uploads/1/3/4/4/134492440/7114596.pdfIn PDF document text
    • https://ruzejeparofilag.weebly.com/uploads/1/3/4/5/134582671/8fed1af92fff15a.pdfIn PDF document text
    • https://bimevaxufozuz.weebly.com/uploads/1/3/2/6/132683359/84c02015b243.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500882/normal_5ffc2ab6a5ee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421341/normal_5fd2efe2306e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444371/normal_5fec30e2bdbbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420029/normal_60c1c7ef43c3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388814/normal_5fdf70b9ae983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc45a1a-e1ff-4356-8d02-1fba714e5a85/73382951337.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/f/does_tubal_ligation_cause_weight_loss.pdfIn PDF document text
    • http://wusagem.pbworks.com/f/zawumoparexovo.pdfIn PDF document text
    • http://redelaw.pbworks.com/w/file/fetch/144535962/41465373347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92706298-0e45-4d09-924c-d3719a879aff/58543901376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804c0ae7-ee58-491a-9989-1a18fce49f8e/frases_del_libro_monje_que_vendio_su_ferrari.pdfIn PDF document text
    • http://matajin.pbworks.com/w/file/fetch/144835776/leitura_e_interpretao_de_texto_em_ingles_7_ano_com_gabarito.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_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 5572 bytes
SHA-256: 97e35bcb8f542945b15b9a455599dda9c01da7b2f36993a905ec5bff0ec8ef3f
font_01_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 10896 bytes
SHA-256: 5bc457165418cc40b8ddd10ae762df2c1f0d0d73e2e1a78e6aa64d567134b151

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