Malicious PDF — malware analysis report

Static analysis result for SHA-256 17130cac4a703d94…

MALICIOUS

PDF

101.3 KB Created: 2021-05-07 18:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e341e98fe055fa07538f526498df8a0c SHA-1: 7d7bce5027383bb23e731114c1a1deee1eb1e83c SHA-256: 17130cac4a703d94f5775c8011d6bd18b1d36808935008a5e99809409004be67
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=what+are+the+three+examples+of+norms
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/197543.pdf
    • https://cdn.sqhk.co/jagibuvat/ih9JihP/9564749267.pdf
    • http://kefijor.mygamesonline.org/random_sampling_advantages_and_disadvantages.pdf
    • https://cdn.sqhk.co/sebidurubuze/Vjajchi/free_templates_for_brochures_publisher.pdf
    • http://levantegroup.net/45300797381nl8vo.pdf
    • http://alteramaks.world/84414251832mguu3.pdf
    • https://cdn.sqhk.co/gixelotopa/gIieWgf/my_talking_tiger_game_download_for_mobile.pdf
    • http://kersita.fun/music_notes_tattoo_smallkannu.pdf
    • http://bestsaleshopin.xyz/71052424440955q.pdf
    • https://kirimobo.weebly.com/uploads/1/3/1/0/131069812/9043525.pdf
    • https://cdn.sqhk.co/dodagirojep/UHAqjb5/papevuzujo.pdf
    • http://blekrossi.ru/87176727906ti22c.pdf
    • http://mebets.xyz/6305339460j1yt.pdf
    • http://kogemotuju.getenjoyment.net/4913432160.pdf
    • http://pemufosapakem.mypressonline.com/cite_mla_8.pdf
    • https://cdn.sqhk.co/vorinugobol/ijJFhdk/fast_driftssted_i_danmark_registrering.pdf
    • http://ig-about.net/82792075295wc3s6.pdf
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/21eeb608.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_90103a52a86f42fc89b269eb67995136.pdf?index=true
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_6b2f2f53543347e498baaded8eaff3cc.pdf?index=true
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_53595c55144a4dfcb77fcdb9830430e8.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_off00014fd4.bin
8f2fb0b846b621061515e2274a1d735f23a27b4b337521c46d3965c19519df68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD4 5220 bytes
font_01_sfnt_off0001617c.bin
4fa2ef4b74b051f6cc600045cb10bc3707e4c61eace85029cfdf5d9569277c50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1617C 11336 bytes

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