Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cd6bb38695ccd9…

MALICIOUS

PDF

86.5 KB Created: 2021-03-29 20:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: da5407ca5bd2e3bdc171962ab4205162 SHA-1: 5207e298dd3f006f4611c7a4bf35c9fb812e88e3 SHA-256: b7cd6bb38695ccd989c94d4084f19e43b16731f754af86f5556769f5b511e9e1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://baarspo.ru/strik?utm_term=how+to+fix+toshiba+lcd+tv+black+screen PDF link annotation
    • http://terakusinuw.mypressonline.com/aarti_durga_maa_ki.pdfIn PDF document text
    • http://basvuruizleme.online/woluparadefofizar0fx5v.pdfIn PDF document text
    • http://prizinsta365.online/pokemon_heartgold_strategy_guide_download06y4u.pdfIn PDF document text
    • http://pirizatifi.iblogger.org/basic_accounting_concepts_in_marathi.pdfIn PDF document text
    • http://muwikobifeke.22web.org/21434709493.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/e1c760.pdfIn PDF document text
    • https://dapeborax.weebly.com/uploads/1/3/0/8/130813135/2fcd08c5dc.pdfIn PDF document text
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/rototoriwusaxibeji.pdfIn PDF document text
    • http://igcopyrightforhelps.com/melalowegajub5l8j.pdfIn PDF document text
    • https://soliduratop.weebly.com/uploads/1/3/2/3/132303261/6967707.pdfIn PDF document text
    • https://wixuzezokanozav.weebly.com/uploads/1/3/4/6/134663812/kesiduworagoxinera.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/307869554582r6ne.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_7af230d9008f4775a522dad2add925d5.pdf?index=trueIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/algebra_2_practice_5-7_completing_the_square_answers.pdfIn PDF document text
    • http://ligeziwofumupo.epizy.com/96381760688.pdfIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_afb174f387424323bca132ead8dca2f4.pdf?index=trueIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_d7a6972e492b4ae28ccb8e0ff60af9a3.pdf?index=trueIn PDF document text
    • http://feliruxitekul.epizy.com/free_calendar_template_2020.pdfIn PDF document text
    • http://donarup.rf.gd/19591877674.pdfIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_2e396217a87642edbc40b750eee09721.pdf?index=trueIn PDF document text
    • http://furovival.rf.gd/442654112.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_off0001148a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 5492 bytes
SHA-256: e1668fd6dcb08311d13b592098d941e6d48dd2e8b6193c9a3c81b33df2bc06b8
font_01_sfnt_off0001274c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274C 10932 bytes
SHA-256: ea1f9e72f946c707ce0935a0baa708b9a80efb03e5a993a254fd56700a4248e6

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