Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6dbc94138e54e29…

MALICIOUS

PDF

78.0 KB Created: 2021-04-06 11:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0836d58705bb5203f9ca611a08c021df SHA-1: 8b41feb588416979e70c0bec62050cfce27af600 SHA-256: c6dbc94138e54e29c5f390615a5f80ab1a59e20c721bf1261d1e7bd601881faa
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to direct users to a network of potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the link farm pattern are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=1997+7.3+transmission+cooler+upgrade+kit
    • http://agencymedia-ig.com/best_price_waterpik_ultra_water_flosser_australiakka61.pdf
    • https://static.s123-cdn-static.com/uploads/4451018/normal_6009883f3d89a.pdf
    • https://cdn-cms.f-static.net/uploads/4456379/normal_5fda97c842b9e.pdf
    • http://pro-komp-master.website/ytd_download_status_upgrade_to_proros2l.pdf
    • http://tujozavido.66ghz.com/probability_and_statistics_2_tutorial.pdf
    • https://cdn-cms.f-static.net/uploads/4478134/normal_600cb4933027d.pdf
    • https://cdn-cms.f-static.net/uploads/4417037/normal_604a8331282c1.pdf
    • https://cdn-cms.f-static.net/uploads/4457620/normal_6029cfa790be6.pdf
    • https://cdn-cms.f-static.net/uploads/4446036/normal_6066326a1959e.pdf
    • https://cdn-cms.f-static.net/uploads/4471960/normal_6056e85b29a93.pdf
    • https://cdn-cms.f-static.net/uploads/4393485/normal_6068f137e60a4.pdf
    • http://santecmb-sarl.com/fesomufuwataxewob0ngw5.pdf
    • http://buloshnaya.site/bipotamariluxatipariq8gfx.pdf
    • http://verefdliyvtorogo.xyz/referat_abatere_disciplinara_angajatfdpnc.pdf
    • http://detonicinitalia.website/gefinaxlhmn.pdf
    • http://mivetys.xyz/81361145580dumqx.pdf
    • https://cdn-cms.f-static.net/uploads/4369776/normal_6041655140a6d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nibilenazo.epizy.com/wejapovake.pdf
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_e23fd03c2e02472aa0493fd8e03c7d41.pdf?index=true
    • http://fizetoxeloxiti.rf.gd/21365475789.pdf
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_a4febed3920541ee93dcd5cd7ed89d0e.pdf?index=true
    • http://widuwuzal.rf.gd/burney_relief.pdf
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_143e9f4ee14842ebabc6bbec2df37426.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_off0000ed99.bin
3f7f97ad79d6f3049ae97ae0cf48808f18c2cb16b9a7c42a159e9701629736a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 5848 bytes
font_01_sfnt_off00010176.bin
84f1f1b697bfd697d2ec9aa56b02931a8b5168f49abf32cc1e19b6b2ac6ed409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 11540 bytes

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