Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e14cd51b174761…

MALICIOUS

PDF

80.3 KB Created: 2021-03-31 07:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6f8caa24820c36d5deb81df80f2026a SHA-1: 50a077481226f7ce9016e5b19c5fa4269c00a141 SHA-256: 33e14cd51b174761bea65a7132589ad6beb740b0381b04d69e08cfb8bfdc9be0
196 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, suggesting it's designed to direct users to multiple external PDF documents. One of these external links, 'https://resalured.ru/strik?utm_term=voicelive+play+gtx+factory+reset', is flagged as a potential malicious URI. The presence of a password-protected archive lure heuristic indicates a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://resalured.ru/strik?utm_term=voicelive+play+gtx+factory+reset
    • https://vapomawuwe.weebly.com/uploads/1/3/1/3/131398268/8488114.pdf
    • https://cdn-cms.f-static.net/uploads/4423714/normal_6016faec03a2a.pdf
    • https://xijuxesipokufi.weebly.com/uploads/1/3/4/0/134042605/956c3e5f.pdf
    • https://bamiwesuwo.weebly.com/uploads/1/3/5/3/135390748/e22b6f0bdbb.pdf
    • https://sepolekabu.weebly.com/uploads/1/3/1/6/131606201/bitepaxuf.pdf
    • https://cdn-cms.f-static.net/uploads/4500668/normal_603856acdd8d0.pdf
    • https://cdn-cms.f-static.net/uploads/4453734/normal_6055c966b9861.pdf
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/litogolezonik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d96be1f0-f610-482b-80f9-c2a0ff3cdb25/fullstack_react_native_the_complete_guide_to_react_native_download.pdf
    • https://uploads.strikinglycdn.com/files/5c8a3913-7f19-4cef-8a7e-da06ecc3b5df/how_to_find_net_profit_before_tax_in_cash_flow_statement.pdf
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_0dd311b23e5446bc9545af2b0d7b3cb6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f2e27832-6c80-40e7-a35a-faae47ab8681/rugerelirutusisopume.pdf
    • https://uploads.strikinglycdn.com/files/f2d32421-8aac-4517-9c95-a8ac3bf55c0d/motigisoluziti.pdf
    • https://uploads.strikinglycdn.com/files/47a0c95f-eff9-4a57-8f29-b445c4ed9e94/bobimebe.pdf
    • https://uploads.strikinglycdn.com/files/06099855-2331-4405-b160-88c0d45a7b78/5190041403.pdf
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_940c649511104351a5f9a5c24ab6c649.pdf?index=true
    • https://s3.amazonaws.com/suzujewa/wokesujaturogedeb.pdf
    • https://s3.amazonaws.com/xarojapi/vamigezijosilogunokaxinul.pdf
    • https://uploads.strikinglycdn.com/files/031f03ec-8318-4f24-a848-e996a99aaa5f/27561110911.pdf
    • https://uploads.strikinglycdn.com/files/31fc2233-b70f-49e4-b672-0398c55bb280/kibolapefazinuzipujibunu.pdf
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_c9c7ff681dec43d78cff10caebed625a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9f0abbc3-cef7-4deb-87cf-defa8c4299ef/sazefikikonafelokuxone.pdf
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_388caa73dd0143c79f43e49175776dcb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3dae382d-083f-432c-ad15-975d534fad59/detijafi.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_off0000fceb.bin
5e37c2695f24f8da2b5b1adc01fc42b95fe84047af6f8a9e7ccfc20ccbc996cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 5376 bytes
font_01_sfnt_off00010f66.bin
f156bd9266501dd673ee6886b7d731fc8fb4461aed56c1c6b97490936c6583c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 10580 bytes

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