Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5e3ca23a060b92…

MALICIOUS

PDF

91.0 KB Created: 2021-05-12 15:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 76b8c1e69c360a68297725e74a3b2c75 SHA-1: 9843f54ead2db2223b5d4054e8b8628c60ec4c70 SHA-256: bb5e3ca23a060b923c7a91ec7a0cdacdfad79343bfa54798771827335fbb1bba
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 ClamAV and 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 0.9996

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://leonvi.ru/strik?utm_term=samsung+s4+mini PDF link annotation
    • https://cdn.sqhk.co/gavezexu/dmhKwia/traffic_rider_apk_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/SHViggj/83674779346.pdfIn PDF document text
    • http://899themes-demo.ru/medios_de_comunicacion_actuales_wikipedia4yzc2.pdfIn PDF document text
    • http://scrlt.xyz/7357566004khi8p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497346/normal_6047e52d8cde8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382779/normal_5fcbe534246b0.pdfIn PDF document text
    • http://hurricane1.space/sabuxugupotikufolatlc2lk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412900/normal_6062e5cb16d2a.pdfIn PDF document text
    • http://arendagg.xyz/charles_proxy_3._6._5_freeycvqx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447466/normal_5fffe0c828360.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/c6qjjnN/moxozelelofom.pdfIn PDF document text
    • http://kushtanash.ru/martin_county_schools_nc2n53j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_5259eb3f0977479c97adf83186e8554c.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_9f93d2aaf8a64bfebecf3a94951aa104.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_fb161e7285604313841f6b692ae1cdea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb5a0e17-f80d-42d6-8bb9-cb63327a74cc/how_to_do_single_crochet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d40c82f0-9115-4ea7-91b4-21e90a8771a4/xezevubefapiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6474b981-b3a4-4d1c-8318-d8256e72db9d/didilomapobiwom.pdfIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_8176ca40a1424f619c61ed2ab96b236e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5300cbd-4e12-4fa4-b823-c7c758db3c9b/pafaju.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_9e7202c11c5345c28d0c01c23742cf8e.pdf?index=trueIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_ff13e3d62dc148b39fc0de435cfe7fcf.pdf?index=trueIn 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_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 5068 bytes
SHA-256: 54569ac9084da3f6ad7e03c4cd36996894123773d470b276828788a2fd1810dc
font_01_sfnt_off0001382a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382A 11240 bytes
SHA-256: 619d75c7afe91beb0e79ee1fa32bca7f9c5722232c9e89b10c0e25efad37fff5

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