Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a270f3b458f1b90…

MALICIOUS

PDF

82.5 KB Created: 2021-03-05 11:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e0f1bf5e279cf98a4da5a2e9e13c90ae SHA-1: 2b1e0cbe5b151f84ff0cd2fccf5997697917e24c SHA-256: 0a270f3b458f1b907b1a7576a5aa01a19126b7d3b9e48d54ffb068ab4f2251b4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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/strik?utm_term=amar+o+depender PDF link annotation
    • https://xiligori.weebly.com/uploads/1/3/1/4/131411896/fomapur-likeji-vadanafejug.pdfIn PDF document text
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/legesesafagid_jomal_vutifatixivoku_jekibuxu.pdfIn PDF document text
    • http://doorstepcomputers.com/arai_car_racing_helmets_ukmjw7v.pdfIn PDF document text
    • https://nefikeroliv.weebly.com/uploads/1/3/1/4/131453179/5725573.pdfIn PDF document text
    • http://blaugrana.ru/esp32_wroom_32_datasheetchrgv.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/soxirimazadewejesexiz.pdfIn PDF document text
    • http://mists.space/vutiwiwebejenukozumigie2zkq.pdfIn PDF document text
    • http://dompodklyuch.com/magazine_powerpoint_template_freezwe9m.pdfIn PDF document text
    • http://bikokobolo.sportsontheweb.net/dell_precision_t7400_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_64f3509931b24f33a76d3a0884d10952.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_8e615e3f203c4e26bfdd4a5f2bee3db6.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_4a6aac6533ef44489d0afb202bcec91c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/amplificatore_differenziale_formule.pdfIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_dd048a256c4f4336a302aa89c9196963.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/guilty_crown_my_dearest_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/kutobarin.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/printable_learning_worksheets_for_2_year_olds.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_off000106a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 4884 bytes
SHA-256: d2be22f6d38a22fd16f155bcdff5ace9345c21292630d4a9d4b2081b98e62d7c
font_01_sfnt_off00011720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11720 12212 bytes
SHA-256: e35bcfe6002a8c510298fbe6391ec94dd98bd758d104948799aa598831631a72

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