Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6089fc850b7e5bd…

MALICIOUS

PDF

85.7 KB Created: 2021-04-03 09:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1986b6918d91c292a9c1a22646d572b1 SHA-1: e125f1af247025e2f986dbb800785aac1805958c SHA-256: c6089fc850b7e5bd78a48cb83d6c471402c7152221436e2aa2b748d3a3d7d890
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 to PDF files, suggesting a link farm or SEO manipulation tactic. The primary URL, https://pelibifir.ru/strik, is likely part of a phishing or malicious redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, possibly involving JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+the+four+phases+of+the+moon+occur
    • https://static.s123-cdn-static.com/uploads/4417675/normal_60098ebd0f601.pdf
    • http://help-lnstagram-verifycopyrgiht.com/college_world_series_baseball_2017hhd6g.pdf
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5fd67d560101a.pdf
    • http://profapp.pro/vewivadisugukorozimamrc0yo.pdf
    • http://ipai.online/how_to_speak_to_someone_with_confidence6s0n6.pdf
    • https://cdn-cms.f-static.net/uploads/4470232/normal_604b95593a239.pdf
    • https://static.s123-cdn-static.com/uploads/4453902/normal_5fe2153167a4b.pdf
    • http://websporizle3.com/boy_scout_popcorn_salestqka4.pdf
    • http://899themes-demo.ru/how_much_do_construction_project_managers_make_in_californiajhuxf.pdf
    • https://cdn-cms.f-static.net/uploads/4387698/normal_605560f88de52.pdf
    • http://laludinemolat.sportsontheweb.net/are_junk_bonds_a_good_investment.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuguvoxoki/book_of_assistance_arabic.pdf
    • http://kilarosine.atwebpages.com/97517000445.pdf
    • http://mozaninukokefef.onlinewebshop.net/87556295887.pdf
    • https://9f1be152-2ea1-4306-981d-bfff62ad382d.filesusr.com/ugd/08fb22_b672dc4d0dba45bdb85eb1fef10215c6.pdf?index=true
    • https://8aa13d94-a051-4bfa-911d-5e7c2f772018.filesusr.com/ugd/382cc4_86d0961ea1614d1bb4da3687916987b9.pdf?index=true
    • https://s3.amazonaws.com/kexamoxusinixu/6266576498.pdf
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_ab2c3a3c20514ffe9c348807e6a6a4c0.pdf?index=true
    • https://s3.amazonaws.com/resixexi/pumijusapadojegavirowek.pdf
    • http://kozogasivufi.myartsonline.com/4483719917.pdf
    • https://s3.amazonaws.com/rafiralexezol/adaway_for_android.pdf
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_7b0ce1712a7549fdaa756fb9587e899c.pdf?index=true
    • https://s3.amazonaws.com/nafibanefexex/cell_as_a_city_worksheet.pdf
    • https://s3.amazonaws.com/mutirexa/83460825942.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/microsoft_sql_server_management_studio_documentation.pdf
    • https://s3.amazonaws.com/jizubisetebof/zididenogamilixupiban.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e02.bin
1b362770c647edd67640f82b72ca4de4737aba636c9a6b8a3fb88f2bc859cf7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 5276 bytes
font_01_sfnt_off00011fda.bin
80a26b4bc56089d90d92c48954dc0a88a48efe92b7af9fca1f11e8c45c86530b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 11832 bytes

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