Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bc7cb80174c1eb…

MALICIOUS

PDF

97.4 KB Created: 2021-03-10 09:39:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e68a9b548d9a6ef95ae6afe425b10895 SHA-1: 15ffae5ae65bb8cd7f199048aceaba89f8b05290 SHA-256: b2bc7cb80174c1eb582cf154ea4feb44952c8510f85fa8c015ce903d6a06378e
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://xajibur.ru/aws?utm_term=hdhomerun+prime+firmware PDF link annotation
    • http://nalovegitiga.22web.org/6143165191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_602df59f08aa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460725/normal_5fe87ce902d19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464080/normal_60071b38a2ecd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_60358eff4ca3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5fd7b9b8efaf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369648/normal_5fcca6b3778b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475380/normal_603747127f23c.pdfIn PDF document text
    • http://fexekozupupuge.22web.org/doors_9._6_user_manual.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/vavale/lubidexibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298fb6b2-4e84-4a9d-96fb-d33b7bc68b92/28776130228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4302bc-3fb4-4652-97c9-609f680be428/molerivujirigovabezed.pdfIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_9a78291318bc447e8f462dffb6a9ebd6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/joterige/messenger_ios_6.pdfIn PDF document text
    • http://fikikozazilut.rf.gd/adding_fractions_using_number_lines_worksheets.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_52bc8f26721740f9b32c1c1f1f1bd62f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf0e626-58df-40a9-b8d0-e3d832d483bd/1468403808.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_d48a9bc11b174fc5831a4975f23f47e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widuxade/relevudananawunisunum.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_178f5e3fb6d14fd18fb58bf8b3847497.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejifavo/kivixilotoxikibapidakeniw.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_97808cffdf6e49fb9d4fda9403cbc468.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_off00013f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F01 5124 bytes
SHA-256: a2641841f9b567ff5a6e8ad97b30cffa066611200c3a0ff4832fa4a92f469600
font_01_sfnt_off00015050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15050 11876 bytes
SHA-256: 84c1175cf8539240759c02c672ac1d445f822862862e9adf4077285f8b69b233

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