Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4c3a60058f8d7b…

MALICIOUS

PDF

79.3 KB Created: 2021-03-12 02:30:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1c179d8c61e90f85c6623bd723ac7f47 SHA-1: 273f10527f50caf3350d5338df91404f7405bbb9 SHA-256: 3f4c3a60058f8d7bcab48cf0d87b2349a7cdcad177611818d34cb854b1e32669
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a lure related to a search query. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, suggesting a phishing or scam operation. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving redirection to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=tropic+of+cancer+crosses+which+countries PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fcb98b56e0ee.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/jikosomuwavosavikozufu.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/abbayi_class_ammayi_mass_video_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455179/normal_601334aed9cb6.pdfIn PDF document text
    • https://cdn.sqhk.co/pijavagoke/YUp5hf4/dafof.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/51686179997.pdfIn PDF document text
    • http://sefobadivura.iblogger.org/ballpark_normal_font.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/gghjgeM/54294223504.pdfIn PDF document text
    • http://bepifukikuku.mygamesonline.org/kusebuxarudarupaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483354/normal_6046e9b38f1fe.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/mla_citation_online_article.pdfIn PDF document text
    • https://cdn.sqhk.co/wuladupuzo/he4rfic/59247389502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_601ee6834b62d.pdfIn PDF document text
    • https://cdn.sqhk.co/xapomijamuji/0he7dii/avengers_endgame_tamil_movie_full.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/how_to_do_a_lab_report_for_physics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483610/normal_6015903f00dda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_83454869eeaf424eaa75f919682adfe6.pdf?index=trueIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_715fb39082484ffd985dca3d62feda03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26fb5de-e19c-4f04-9cae-8214536c4c7a/how_long_does_iso_27001_certification_last.pdfIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_174a7ecdfb6d42f8b5a727c1d291a980.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3ac209-5af3-478a-84dd-3d3f22aaf454/fesenoxebe.pdfIn PDF document text
    • http://nufolupi.epizy.com/monajomag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615f898e-5261-472d-b232-a2f82f06f7ae/how_to_use_a_pick_lock_gun.pdfIn PDF document text
    • http://wigunegulawiko.rf.gd/sojuwomabarikawabul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a11df20-3c61-43d9-90d6-43cf997c2571/laliku.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_615acb4b9c9048dab2c4b950dd5abdf0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 5112 bytes
SHA-256: 7264478bfda262074e865f7f95db3adafe626542fe55d8628fa8c294a829b557
font_01_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 12000 bytes
SHA-256: e17a2b34fc3354fd01c7b5184646868a29fd2d7057a7e089ed93b27229ebbf61