Malicious PDF — malware analysis report

Static analysis result for SHA-256 628b55aaa1381aad…

MALICIOUS

PDF

78.2 KB Created: 2021-04-09 10:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 222bca99e412b0d63f5496cc3a828783 SHA-1: 8e2497b849d3227d10ab5a0436ccd969b6813f9a SHA-256: 628b55aaa1381aadedb27e577114e22a8ac9fb5ab47d013f875c68337bf28289
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are likely part of a link farm or phishing scheme, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=sex+and+the+city+3+film+trama
    • http://idealsit.fun/wuxasatolajtpz3r.pdf
    • http://megopoveguvujal.medianewsonline.com/toda_la_historia_de_la_tabla_periodica.pdf
    • https://static.s123-cdn-static.com/uploads/4383300/normal_5ffd39ff9356a.pdf
    • http://govovimifakine.mywebcommunity.org/51504145168.pdf
    • https://static.s123-cdn-static.com/uploads/4386830/normal_5fca3acb15bfb.pdf
    • https://static.s123-cdn-static.com/uploads/4367017/normal_5ff12e60119f5.pdf
    • http://evatopshop.xyz/how_to_play_queen_on_piano_easyz7gzw.pdf
    • http://lamovingcompany.com/ruger_1022_parts_diagramv70pl.pdf
    • http://fullhp.info/download_porn_videoswfgll.pdf
    • http://ayazshabutdinov.club/8979328792034lvy.pdf
    • https://static.s123-cdn-static.com/uploads/4379485/normal_5fcad5b3bd5a3.pdf
    • http://housefashion.ru/wimble_pong_tennis_2d_tennis_game_downloadznw79.pdf
    • https://static.s123-cdn-static.com/uploads/4422168/normal_5feb07b46760a.pdf
    • http://bellissimo.online/noravuferagazebusanosomib9hnwd.pdf
    • http://sarkife.site/tigepemogbb9f.pdf
    • http://mevukavotidu.getenjoyment.net/why_is_my_keyboard_not_working_on_minecraft_ps4.pdf
    • http://zofugef.mypressonline.com/birkat_hamazon_wedding.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0816b8db-db6e-4af9-a106-1766ff0f8d73.filesusr.com/ugd/06e6c8_594fe1ce64c6405ea15c94ee1c16d255.pdf?index=true
    • https://s3.amazonaws.com/nijudow/apa_citation_bibliography_format.pdf
    • https://s3.amazonaws.com/paxuvagal/fupesevobuzirabazefojasus.pdf
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_090f6b0ddf66454ab1fcaa3d5989e0e4.pdf?index=true
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_f8e76d66fc404725aa42bf506e972234.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_off0000f0c5.bin
b0113ddf4a61f77ab463081c56823e8546250fe97517f60ffc7409f02aaf2d04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 5520 bytes
font_01_sfnt_off00010376.bin
37a40313404dcd65b55242b1bfa588eed60f0ad1b349ecc7172f2436856cae9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 12308 bytes

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