Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b76d198eb025c2…

MALICIOUS

PDF

80.1 KB Created: 2021-02-27 04:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f46743df3c900e3f33b018609e757d9b SHA-1: f338ef7f5cd3758a941bf4d9eb282ea191d2fab0 SHA-256: 57b76d198eb025c21619a6484db79c4c67d58090e006d38acc6e015b6997e23c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL found is https://vilenefex.ru/award?keyword=how+much+does+pole+vault+weight, and numerous other PDF links are present, indicating a potential distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=how+much+does+pole+vault+weight PDF link annotation
    • http://bopolubolef.mywebcommunity.org/57061380742.pdfIn PDF document text
    • https://dajikapepexav.weebly.com/uploads/1/3/4/5/134597014/tewevadeb.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/425519.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/iaojcid/game_of_summoner.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5fd62ae2c071e.pdfIn PDF document text
    • https://pemiliruvobavex.weebly.com/uploads/1/3/0/7/130739389/nuzolux-nitoju-bisatugav-xufujalurus.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/asp.net_mvc_with_c_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/jiajdie/96507145031.pdfIn PDF document text
    • https://duzejuwilana.weebly.com/uploads/1/3/4/8/134879611/47071.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/heSOdif/pajisedogarap.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/cjgeyha/resident_evil_6_el_capitulo_final_reparto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5fc6cc6a3605e.pdfIn PDF document text
    • https://tenogamux.weebly.com/uploads/1/3/2/6/132681545/02be4df2b17ce2.pdfIn PDF document text
    • https://rexakutomas.weebly.com/uploads/1/3/0/7/130739652/8164080.pdfIn PDF document text
    • http://xosuvirakogaf.iblogger.org/o_poder_da_esposa_que_ora_frases.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vumamuv.myartsonline.com/how_to_sync_airtel_dth_remote_with_sony_tv_remote.pdfIn PDF document text
    • http://lonozixugixapap.epizy.com/google_marketing_platform_campaign_manager.pdfIn PDF document text
    • http://ropasibemufi.epizy.com/meaningless_adjective_form.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_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 5504 bytes
SHA-256: acdb3390c3766cfe6acaba1928e092ff13c1fdbd0858c1329e8cc93ef776abbe
font_01_sfnt_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 10856 bytes
SHA-256: 0d7861768ff875d5ebb2715885d29788e90b369ea7bfbf57791c6825857cbc4a

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