Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3082357ec706672…

MALICIOUS

PDF

85.1 KB Created: 2021-03-23 18:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4b5ed6a069555f8b962edd9f597e8d3 SHA-1: 58938f340acd6376ae50e043b22bde0e58a97293 SHA-256: c3082357ec706672108ee82af99271ac6a0c09c3413f84b7d64d41b3fc956089
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs. The document body, though heavily obfuscated, contains text related to 'Hernia diafragmatica en adultos pdf', suggesting a lure. The primary malicious URL identified is https://pelibifir.ru/123?utm_term=hernia+diafragmatica+en+adultos+pdf, which is likely used to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=hernia+diafragmatica+en+adultos+pdf
    • http://study-english-05.site/cosco_simple_fold_high_chair_washing_instructions9ga63.pdf
    • http://afracheat1.xyz/the_great_i_am_lyrics_james_fortunerq3pn.pdf
    • http://wofurasosezisax.mywebcommunity.org/vuwidiliruxuxi.pdf
    • https://cdn-cms.f-static.net/uploads/4446275/normal_602c336380087.pdf
    • https://cdn-cms.f-static.net/uploads/4485163/normal_602b52618c482.pdf
    • https://static.s123-cdn-static.com/uploads/4426075/normal_5fe29fc8a2e7c.pdf
    • http://womovenum.sportsontheweb.net/jujufepemizijojuroja.pdf
    • http://flowerport.market/jixoridabapexasusukexovamcck4.pdf
    • https://cdn-cms.f-static.net/uploads/4490272/normal_5fd60f1e1a22e.pdf
    • http://istra-backwater.ru/buxujododr7.pdf
    • http://igme.site/what_is_secret_city_on_netflix_about4uwxj.pdf
    • http://grigolia-studio.ru/30412980190qa9j3.pdf
    • http://xtreme-sport.ru/95438279879ycbx2.pdf
    • http://kinoxca.xyz/pusanawobiwakofubomemeezyhr.pdf
    • http://yatvoyya.fun/velineon_vxl-3s_specsccpv5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fuluxewamotate.atwebpages.com/52123710221.pdf
    • https://s3.amazonaws.com/bomupi/pediatrics_advanced_life_support_guidelines.pdf
    • https://s3.amazonaws.com/patilawasu/doom_rpg_android_apk.pdf
    • https://s3.amazonaws.com/lomogas/chartered_financial_analyst_cfa_institute.pdf
    • http://nojikigor.myartsonline.com/use_a_geometric_formula_to_evaluate_the_integral_calculator.pdf
    • https://s3.amazonaws.com/fujadabez/38466721766.pdf
    • https://s3.amazonaws.com/jemisajoda/60540766479.pdf
    • https://s3.amazonaws.com/tokit/74406224874.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_off00010b96.bin
2a07fef6c2ebdf96985f42f65bb7e56a0380f6577d9a06d5a490ab43657302d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 5436 bytes
font_01_sfnt_off00011e02.bin
993b0f2efad39c6b35c2359795a6aeecbac7cc15f0e028cbe775e6ca46259dd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 11996 bytes