Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb7db99f3ddb9f0…

MALICIOUS

PDF

86.4 KB Created: 2021-03-09 13:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7941e768559c0dc88c2733f4ca3c57d SHA-1: dd8ec3b157670c2ee7c5025bb1bbf6ebb5f4d282 SHA-256: 3bb7db99f3ddb9f0d72d3a879937083998d6019f01300978ca9c78a74f3a3a63
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=nobela+fingerstyle+tabs+ukulele
    • https://cdn-cms.f-static.net/uploads/4415546/normal_6019c3db42339.pdf
    • http://craftsmansmetics.com/computer_dos_commandskfdtu.pdf
    • http://testersairf.xyz/87681727158dil1f.pdf
    • http://hiziryigit.online/minolu1be4e.pdf
    • http://update-win20.online/756410220118qpve.pdf
    • http://italywow.pro/577224726992rqtz.pdf
    • https://static.s123-cdn-static.com/uploads/4473053/normal_5fffa164a01bf.pdf
    • https://cdn-cms.f-static.net/uploads/4392872/normal_5fd324e62c514.pdf
    • http://propovar.ru/wovirufopazabufh2nh.pdf
    • https://cdn-cms.f-static.net/uploads/4426060/normal_60143ba5aa331.pdf
    • http://reabook.online/42508848911be6a2.pdf
    • http://detonicufficiale.website/gogoragixalokae8dy.pdf
    • http://circulshtangcalip.website/lixaxixonh5bgn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tawosutosuxi/96069307824.pdf
    • https://s3.amazonaws.com/divikufifir/3_week_look_ahead_schedule_template_excel.pdf
    • https://s3.amazonaws.com/nigimul/xefapadu.pdf
    • https://s3.amazonaws.com/mokixetat/what_do_you_understand_by_quantum_tunneling.pdf
    • https://s3.amazonaws.com/rokuwapesu/cisco_sfp-_h10gb-_cu1m_datasheet.pdf
    • https://s3.amazonaws.com/kabisebax/93689424966.pdf
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_3c26d85639724e76a8c1b460eb2244d1.pdf?index=true
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_19dff4168e254bdf933037465149dff4.pdf?index=true
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_9bbb65f27bb745bdb22532f7da21bc00.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd22.bin
79feb93e12afbe3a3381082682d791289e6b8ffc767d2d228e1475f553376148		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 5208 bytes
font_01_sfnt_off00010f01.bin
97094fc94ccd2e947512a6efc60da1ce4861d325b597a7b5e35962e77193cb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 12096 bytes
font_02_sfnt_off0001374c.bin
9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1374C 16036 bytes

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