Malicious PDF — malware analysis report

Static analysis result for SHA-256 630c4eb3a6a012d9…

MALICIOUS

PDF

74.6 KB Created: 2021-03-22 10:27:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 832d634b8352db369c76d6ac5589eb6c SHA-1: 8a01985ad418c4360ef1a5261c79bf29be48b954 SHA-256: 630c4eb3a6a012d985708f810bfa0fc089352fad9841d2739144ffae874575fa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and exhibiting characteristics of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=busch+light+nutritional+information
    • http://artyom.guru/how_does_a_continuous_flow_hot_water_system_work4jzir.pdf
    • https://cdn.sqhk.co/kagalitisup/ihjjbji/missing_child_found_2_years_later_in_wall.pdf
    • https://cdn.sqhk.co/jifegusewe/EqEMHie/38858837808.pdf
    • http://justamorem.com/requirements_to_work_as_a_social_worker_in_australia4iqfc.pdf
    • http://raisinshub.pro/966385055862feyf.pdf
    • https://cdn-cms.f-static.net/uploads/4418001/normal_600f5cf9a34fd.pdf
    • https://cdn-cms.f-static.net/uploads/4370090/normal_601cfd7051c87.pdf
    • https://cdn.sqhk.co/rajexizeba/jfSgdia/marketing_follow_up_sheet_excel.pdf
    • http://2220202.ru/graphic_designer_salary_nz_per_hourt614r.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bbc4cfb3-0f74-431a-93c5-7b2b919d27c6/horus_heresy_novels_wiki.pdf
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_885b22e5f99c48cca1e2bffd24f2c3ee.pdf?index=true
    • https://s3.amazonaws.com/boduxatavepe/google_drive_file_stream_windows_7.pdf
    • https://s3.amazonaws.com/midipes/46286830004.pdf
    • https://uploads.strikinglycdn.com/files/0ab57040-b50d-43a3-a26c-9ae8731ec64b/putiridoxugajob.pdf
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_9b7a12a91e164673a9d264b6685d8b9e.pdf?index=true
    • 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_off0000e4fa.bin
e8cbfae5c69b008a586133ddf43663b707b781395b23c9427f9ec2d2980ca51e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 5344 bytes
font_01_sfnt_off0000f702.bin
e07dd52265dbb0480f1870958e2fb8372454cdd277311d944870d4e334fc27fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 11200 bytes

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