Malicious PDF — malware analysis report

Static analysis result for SHA-256 894c6ea0978ae8c6…

MALICIOUS

PDF

74.5 KB Created: 2021-02-21 19:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0157f3d89f844bf356297954453c673a SHA-1: 2fe6cf67c2e4c0577f324e559cde71994a76a369 SHA-256: 894c6ea0978ae8c6d160b7fb5f9cb7579706f125caab28bd908e6bfd7d495104
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/wb?keyword=starting%20your%20own%20online%20business%20nz PDF link annotation
    • http://maxist.ru/nidisasokorefakuziwoliiptcm.pdfIn PDF document text
    • http://levelupguild.com/2014_nissan_armada_platinum_manualau5p6.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/how_to_calculate_heat_chemistrygt7cn.pdfIn PDF document text
    • https://lipijunozawisek.weebly.com/uploads/1/3/4/7/134721324/9101801.pdfIn PDF document text
    • https://gevexewu.weebly.com/uploads/1/3/4/0/134018209/wirepapopinezupiji.pdfIn PDF document text
    • http://idealicaitaly.site/icsee_for_pc_windowszxu0l.pdfIn PDF document text
    • http://freud.icu/microsoft_powerpoint_design_templates_freevgs33.pdfIn PDF document text
    • http://persequenteamsohbet.com/muxezefinagowaix5ec.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/1575502.pdfIn PDF document text
    • http://pitushok.fun/how_to_operate_a_rinnai_gas_heaterd8zly.pdfIn PDF document text
    • http://cleaner-inn.club/97981877509ro310.pdfIn PDF document text
    • http://usacreditcheck.info/zesetireyaskp.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/xetasif/advertising_printing_company_profile.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/electrician_tools_name_list.pdfIn PDF document text
    • http://femejedad.epizy.com/59185931575.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/adminlte_template_bootstrap_4_free.pdfIn PDF document text
    • http://lenadupubop.rf.gd/bosch_security_cameras_manual.pdfIn PDF document text
    • http://kewetevidelumuz.epizy.com/71422782619.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/division_patterns_with_decimals_worksheets_5th_grade.pdfIn PDF document text
    • http://tetomor.rf.gd/kozut.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/12893333416.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/26109298561.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_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 5340 bytes
SHA-256: ff19fc9352bd986cdab55163696ac9be94cc1ee6dd778e43595cfb459943b559
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 10992 bytes
SHA-256: c6e663a657e2429a8a92dc63d41a412c7ce0a2d43d84406315701305a5dea359

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