Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b2ea63fc7a684f…

MALICIOUS

PDF

72.4 KB Created: 2021-05-06 04:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57c122ecd5b8b154330de19247eda1a5 SHA-1: 2f11262a28c4b4ccff6426314abf747ee90d1307 SHA-256: 70b2ea63fc7a684ff50b5ce66ff4fbc0b4092bea3aa086a9052336d7b42328cc
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and numerous embedded URLs. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of multiple external links, including one to 'kuzutuzo.ru', strongly suggests an attempt to redirect users to malicious content or download further payloads.

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-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://kuzutuzo.ru/strik?utm_term=walker+turner+drill+press+manual
    • https://cdn-cms.f-static.net/uploads/4494874/normal_60558e3a0a2dd.pdf
    • https://puxetesotomu.weebly.com/uploads/1/3/0/7/130739839/4cc721.pdf
    • http://lokotahas.ru/lenovo_g50-80_drivers_for_windows_7_32_bit_wifigz0wk.pdf
    • http://lazadacostumercenter.com/amman_stock_exchange_annual_reportisqp3.pdf
    • https://cdn.sqhk.co/bapisolel/hggieGJ/96554728355.pdf
    • https://cdn.sqhk.co/wojipezusax/jtdIgcP/84249090066.pdf
    • http://newyearshop.site/wd_my_cloud_ex2_ultra_2-bay_nas_8tb_testzjir2.pdf
    • https://cdn-cms.f-static.net/uploads/4427105/normal_602f9d406f899.pdf
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/3043d492.pdf
    • http://itash.space/warebedetezaxuximr9dzg.pdf
    • http://deine-gabe.com/fuentes_de_campo_magnetico4dx63.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://relivoziz.atwebpages.com/design_patterns_in_modern_c_download.pdf
    • http://vilumepidiwego.myartsonline.com/33158920097.pdf
    • https://cc603790-e41b-456e-9848-d053b607cad6.filesusr.com/ugd/389793_5cc93a1eaad2466c83f5155e36cfaaf2.pdf?index=true
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_2de22be9a0a2463a91a4f9963c558261.pdf?index=true
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_879098fd9d39466b90146b08f72bee18.pdf?index=true
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_0ed66911bb5345da9f24d7d97fb0d6c4.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_off0000dc89.bin
48d92567aa5835820f6c4085c9b616f526db741e1b14894c888040a36f6f9efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 5184 bytes
font_01_sfnt_off0000ee23.bin
0247d9312206fe571f6ed0d08fc67566f06a3f8b01fda5a74521905be88d9fc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE23 11316 bytes

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