Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b09595faf761546…

MALICIOUS

PDF

80.8 KB Created: 2021-04-12 21:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af7021a298d9b2fa1dc1944d7f06e4df SHA-1: 516805aecc81013db9b446b3c711ca32d0e67608 SHA-256: 0b09595faf76154633f644f192e4a2c7113c393826c5ab03a05acf7da33bdf3f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF SEO link farm. The primary malicious URL, https://kuzutuzo.ru/strik, is likely used to host or redirect to further malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to direct users to potentially harmful websites, aligning with phishing or SEO abuse tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=is+jefferson+airplane+jefferson+starship
    • http://reduslimitaly.website/29157996324rif2n.pdf
    • https://jasefeneg.weebly.com/uploads/1/3/4/4/134489721/xuvogotulujado-rubejevupo.pdf
    • https://cdn.sqhk.co/sabumijobude/bBOijwN/ragadoxadik.pdf
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/wugaxu_tavow.pdf
    • https://cdn.sqhk.co/zozusexub/FigVlge/gevoxesipasak.pdf
    • http://luminar3-download.xyz/692055663348077e.pdf
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/b690f40d5b.pdf
    • http://daludaja.getenjoyment.net/whirlpool_gold_quiet_partner_iii_how_to_clean_filter.pdf
    • https://cdn.sqhk.co/pumevigatare/Gig1Mhf/zuzowalepifawome.pdf
    • http://zuvels.xyz/sozivozavorijegapipaxnulff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mokixetat/lomuba.pdf
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_a7be2979cadc402cb5e54e4729048f56.pdf?index=true
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_da4b2efda171403483fd68c8150b4f3d.pdf?index=true
    • http://marurutefa.atwebpages.com/53601122914.pdf
    • https://s3.amazonaws.com/nutanigonu/tirumajoz.pdf
    • https://s3.amazonaws.com/zabejuvijolu/weather_report_in_bangalore.pdf
    • https://s3.amazonaws.com/fipijife/student_database_management_system_project_in_java_with_source_code.pdf
    • https://s3.amazonaws.com/jofunozuzof/cumulative_distribution_function_of_discrete_uniform_distribution.pdf
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_f505e490bd3a4189b4ff23079533ad3c.pdf?index=true
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_5f6db82d280242d88d1597b8e0a09dc5.pdf?index=true
    • 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_off00010013.bin
4f98fac5db6d207e13269909f6c45a5fa84742e838737ff57da9ab668f50886c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10013 5004 bytes
font_01_sfnt_off00011112.bin
6319c97fb7dbea4ebbc397f4d9281e78ecd595eecda7fa10d23aa1be88bd74fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11112 10808 bytes

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