Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9f732a6cd954c8…

MALICIOUS

PDF

97.5 KB Created: 2021-03-22 09:19:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82cf2f354521a6e45ce2dec6feb26084 SHA-1: b5deda5b830cd87cf25b30064e118e1fd453e1bc SHA-256: 8d9f732a6cd954c893126f9f1ad087ea0f7c1d29da6b9170ce2aa910dfb434af
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 hosted on various domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to drive traffic to malicious sites.

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-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://botokaw.ru/strik?utm_term=communist+manifesto+definition+sociology
    • https://static.s123-cdn-static.com/uploads/4455642/normal_5ff964187389a.pdf
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/69cb496ac43.pdf
    • http://xufuzema.sportsontheweb.net/57299773321.pdf
    • http://vumilopevakidom.iblogger.org/ritotugiwozuvada.pdf
    • https://xudagemiribu.weebly.com/uploads/1/3/1/3/131378943/7bd29c0246fc07f.pdf
    • https://fatibetoliwan.weebly.com/uploads/1/3/4/7/134731660/gexiwek.pdf
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/1152304.pdf
    • http://mazisim.mywebcommunity.org/basic_excel_formulas_tutorial.pdf
    • https://cdn-cms.f-static.net/uploads/4466366/normal_6031d8eea563f.pdf
    • https://cdn-cms.f-static.net/uploads/4485568/normal_603b2bd08e96d.pdf
    • https://static.s123-cdn-static.com/uploads/4385413/normal_5ffbef40718a1.pdf
    • https://cdn-cms.f-static.net/uploads/4485587/normal_60143f934e993.pdf
    • https://static.s123-cdn-static.com/uploads/4452161/normal_600021dfd4e1b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/83432445-7636-45dd-9c45-bc382dcc3381/diccionario_de_espaol_traducido_a_ingls.pdf
    • https://uploads.strikinglycdn.com/files/371423ce-c063-4d71-aaae-646b106756d3/44494364628.pdf
    • https://uploads.strikinglycdn.com/files/7ab69748-4b4f-4630-8634-03c7617ecd93/why_do_i_have_water_bumps_on_my_feet.pdf
    • http://mewadabapubato.rf.gd/17897648106.pdf
    • https://uploads.strikinglycdn.com/files/19e1769c-e7db-4962-8ab7-5c54db05e027/program_xfinity_voice_remote_30_second_skip.pdf
    • https://uploads.strikinglycdn.com/files/003cf90b-ffbb-48c5-923e-66be5bb359af/crochet_blanket_for_beginners_youtube.pdf
    • http://netubufetolanup.rf.gd/blackjack_game_no.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014194.bin
649b5fd81656261f2863ca9cd30aa7258997916262d6b9a7ff3068a6ad436998		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14194 5252 bytes
font_01_sfnt_off0001536a.bin
62f70f9402177e700c6605a7417d6e64c01cf5a270fd22082fc7292d0ac6990c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1536A 11448 bytes

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