Malicious PDF — malware analysis report

Static analysis result for SHA-256 74cdce318931bcb7…

MALICIOUS

PDF

91.8 KB Created: 2021-02-13 04:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d3f6842eb8892919a1fbdfe546f48a98 SHA-1: 276479a8dadd4cd4f95a114d1d14eb89494351a5 SHA-256: 74cdce318931bcb73da0166f0ae3b4fc5c301e4ea28ae4c72e4d5f155d5202b3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing/malware distribution attempt. It contains numerous external links, many hosted on disposable domains, designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing for credentials.

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://druttle.ru/wix?keyword=personal+math+trainer+evaluate+homework+and+practice+answers+algebra+1 PDF link annotation
    • http://nevozepamuj.iblogger.org/8822909395.pdfIn PDF document text
    • https://naruvoraxosu.weebly.com/uploads/1/3/0/8/130873998/7445089.pdfIn PDF document text
    • https://povarudoro.weebly.com/uploads/1/3/5/3/135324530/6782410.pdfIn PDF document text
    • http://xivatididoxu.22web.org/pdfgeni_book_e2020_world_history_answers.pdfIn PDF document text
    • https://natadafupekex.weebly.com/uploads/1/3/1/8/131856288/mixogiwolefuwa_siduna.pdfIn PDF document text
    • https://zufavaxevonek.weebly.com/uploads/1/3/0/9/130969036/b895fdc6.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/xunafigusimulexu.pdfIn PDF document text
    • https://pulapafux.weebly.com/uploads/1/3/0/8/130874232/kevopojixidexawin.pdfIn PDF document text
    • http://jokidinavefo.22web.org/aiims_pg_form_requirement.pdfIn PDF document text
    • http://tekeriset.iblogger.org/78731842898.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375887/normal_5fe3afe4f2894.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/60cf446.pdfIn PDF document text
    • http://satumatajug.iblogger.org/96252283467.pdfIn PDF document text
    • http://bepumekelu.22web.org/kolhan_university_bcom_part_3_marksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nexopuvesoreben.epizy.com/divavukorolawo.pdfIn PDF document text
    • http://raseloxezonavo.epizy.com/email_template_for_emailing_resume.pdfIn PDF document text
    • http://solepaf.epizy.com/apple_iwork_numbers_templates.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 5488 bytes
SHA-256: 9cf5082b64cabdcb3288479f7c5470a382c0a960aaae1eec83377235441d8a28
font_01_sfnt_off0001257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 5896 bytes
SHA-256: fdfd03d502af47fb188565308baf1f3922d8361778174302d5b036c6d7789d2e
font_02_sfnt_off00013974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13974 11648 bytes
SHA-256: daf086ea06a8f329d134e5036703aa0ea4a30038d96bf5459af274a093959509

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