Malicious PDF — malware analysis report

Static analysis result for SHA-256 7685ba4b46688316…

MALICIOUS

PDF

88.7 KB Created: 2021-03-24 14:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5fc3a4479fb51dd5d0b2737ca5af008 SHA-1: 709322fb7ad50a707c3c052f4e0446d53014d63c SHA-256: 7685ba4b46688316b7db02bd46fa8a3bb4c8cdeaad19a57f882aa2563b240264
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as legitimate content, such as game mod downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs point to suspicious domains, suggesting a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://xezojetit.ru/wix?keyword=nuke+mod+minecraft+1.7.10
    • https://cdn.sqhk.co/lotazoza/ichahhg/honda_gx_engine_manual.pdf
    • https://cdn.sqhk.co/juvebuzizej/j9HAixT/temisut.pdf
    • https://cdn.sqhk.co/rivotoxupow/VEYCgc4/62097211783.pdf
    • https://static.s123-cdn-static.com/uploads/4457849/normal_5fcb634fc082a.pdf
    • https://static.s123-cdn-static.com/uploads/4369797/normal_6003275de09ec.pdf
    • https://static.s123-cdn-static.com/uploads/4379370/normal_5fcd712df2013.pdf
    • https://static.s123-cdn-static.com/uploads/4379359/normal_5fedab4c547e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0cf3a8a4-8b44-4b68-b1ac-0ca14f01e9c0/78104078251.pdf
    • https://uploads.strikinglycdn.com/files/168daca4-3350-44bd-b6c7-ac0b23929812/interior_design_styles_2020_quiz.pdf
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_fda2bdd9a4ff424a9ff2f56d651b0adc.pdf?index=true
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_1ea82c0075b041979d1fccb21d7e36d1.pdf?index=true
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_f35ee6e518f64ec0bf92cef2a9c8fec5.pdf?index=true
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_52e7d8636f20422090568743e502667b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/316a030b-4039-4d77-aaf7-4b7567c6d00c/navpers_1221-6_rev_03-16.pdf
    • https://uploads.strikinglycdn.com/files/4045c75a-7d87-4f23-9c5e-c251cebb14d3/what_does_yes_translate_to_in_spanish.pdf
    • https://s3.amazonaws.com/sowirutelevolur/attached_documents_letter_format.pdf
    • https://s3.amazonaws.com/niporofez/pakemijujima.pdf
    • https://s3.amazonaws.com/genukopapovixo/18405548161.pdf
    • https://s3.amazonaws.com/susonanezaj/wamsutta_damask_sheets.pdf
    • https://uploads.strikinglycdn.com/files/603ba967-41fc-4d54-9601-df95cfa815f0/65455830971.pdf
    • https://s3.amazonaws.com/xukonakefules/active_and_passive_voice_worksheets_for_5th_grade.pdf
    • https://s3.amazonaws.com/zamemigojat/20206765593.pdf
    • https://s3.amazonaws.com/litunux/10416361970.pdf
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_54d7292b2d604e3ca4baa5429fb16037.pdf?index=true
    • https://s3.amazonaws.com/wixatax/corazon_espinado_tab.pdf
    • https://s3.amazonaws.com/farowug/14143122281.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f527.bin
6ad749b775dc80022dc10395f66f812ed9c8aa478eb3d477f5452a3b55c00ae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 5180 bytes
font_01_sfnt_off000106c0.bin
5c04a74f290bc0a1c89294004205969f77745befbd32dbe2d497bf4ecdc1d9d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 11732 bytes
font_02_sfnt_off00012f27.bin
854d5ba84f96226b87f76c1d215f77f8d9a4f76406afa66e2a4f1f36a2032b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F27 16376 bytes
font_03_sfnt_off00014547.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14547 4324 bytes

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