Malicious PDF — malware analysis report

Static analysis result for SHA-256 16101333655582ad…

MALICIOUS

PDF

81.1 KB Created: 2021-04-21 22:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d07e8afdac94991d3748ed30d16047c7 SHA-1: cef7885eae48aede056aed9c80bc487a6b948dbb SHA-256: 16101333655582ad5f6e6c9fa4d2aa97be9c6b95fec6e625ce14e7bff4cea954
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm for SEO manipulation or phishing. The primary URL, https://pelibifir.ru/strik?utm_term=crusader+kings+2+elder+kings+mod+download, is presented as a download for a game mod, likely a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pelibifir.ru/strik?utm_term=crusader+kings+2+elder+kings+mod+download PDF link annotation
    • https://nawajutexi.weebly.com/uploads/1/3/4/1/134108687/dinaloviruludugirulu.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/jurizozoneb.pdfIn PDF document text
    • https://mafizawejibon.weebly.com/uploads/1/3/1/3/131383772/5592879.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/41077c8a.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/gja6un3/amour_love_stories_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489722/normal_5fd2056142012.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/6df62d1.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/jbjbihz/105669659.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456398/normal_5ff8ac258878d.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/dw3hepv/history_of_education_in_south_africa_timeline.pdfIn PDF document text
    • https://furetexagorude.weebly.com/uploads/1/3/5/9/135958868/93eb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388424/normal_5fdc6475f2f6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_601f80301d71d.pdfIn PDF document text
    • https://wilulesutazi.weebly.com/uploads/1/3/3/9/133997377/vilivibibamo_favetiw.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzededoz/UQnicih/sample_balance_sheet_and_income_statement._xls.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405662/normal_5fce4052bfe4f.pdfIn PDF document text
    • https://cdn.sqhk.co/bubarozotuj/jV8lnze/xexisoworilevurawuxepar.pdfIn PDF document text
    • https://radixukawatezod.weebly.com/uploads/1/3/4/6/134645496/9e297509222cf17.pdfIn PDF document text
    • https://wutupebepa.weebly.com/uploads/1/3/3/9/133997315/rufunenajesuletimo.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/penale/girls_who_code_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/uber_android_google_play_services_are_updating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b0b8fe-8182-40cf-9459-1e6f3d96313d/mims_medical_microbiology_and_immunology_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/20514589640.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/como_hacer_un_resumen_ejecutivo_para_un_trabajo_de_investigacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0982886f-946f-4839-bb5d-660b7f142e1e/how_to_calculate_the_maximum_stress_in_a_beam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a87f338-517a-4cd5-88f3-f00f15714d4c/videos_de_como_aprender_a_tocar_guitarra_acustica_para_principiantes.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/5726644272.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_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 5336 bytes
SHA-256: 69858f40b9655174114972cc4ea8026a467f0b8aca4fd27ca928e1dda07ebef9
font_01_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 11472 bytes
SHA-256: 284d79c69caa5a9d36de53fff7deeb4de5e125c26deb9bda7549a6c76a0528d8

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