Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d3dc9ed6d94d0b…

MALICIOUS

PDF

80.6 KB Created: 2021-04-24 20:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8d4382d90ca8347c9c613d3e20768067 SHA-1: 31644604af4c610e8cdfdfb00bbe8de135f8a526 SHA-256: e5d3dc9ed6d94d0b86c503571adea349a736d027c90c7df33dcf7676fd0d0856
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous links to disposable domains, many of which are configured as link farms. One prominent URL, 'https://baarspo.ru/strik?utm_term=world+war+z+game+free+download+for+windows+7', suggests a lure for a game download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=world+war+z+game+free+download+for+windows+7 PDF link annotation
    • http://italy-small.space/zevitomufonaxarqjjdm.pdfIn PDF document text
    • http://vezdesami.ru/463920731842gx33.pdfIn PDF document text
    • http://nonly.xyz/39373641827eyzbx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_604d88ae6ff1a.pdfIn PDF document text
    • http://businesslinecenter.com/navien_error_code_302i40yz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370076/normal_5fde5d8c199d6.pdfIn PDF document text
    • http://blubadgehelp.net/86635674639noov6.pdfIn PDF document text
    • http://wiregabjuk.fun/bearded_dragon_names_for_malefod6a.pdfIn PDF document text
    • http://hempmap.ru/jurnal_terapi_bronkopneumonia_pada_anaka475k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_6059b2a5aabae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415334/normal_5fee38cf5531d.pdfIn PDF document text
    • http://usechambre.xyz/14549280395ybo6f.pdfIn PDF document text
    • http://khanapoorti.com/conductas_de_riesgo_definicion67eow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424009/normal_6023cbd73fcb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470679/normal_606ba2399d465.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444874/normal_5ffe1bd0d2f5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414360/normal_6023f31076099.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/551d58a7-1770-4504-9cc9-455fbeeaa34d/woodworking_tools_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/78841844715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c273e74-9192-45a8-8009-d49b6260dbd2/7066798483.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/how_do_i_connect_my_logitech_wireless_keyboard_k520.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/how_to_change_the_toner_on_a_brother_printer_hl-l2380dw.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/dewalt_20v_max_xr_brushless_drill_driver_compact.pdfIn 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_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 5460 bytes
SHA-256: e4c535246da5d05ff0d9a8b28e16943f4ac751a6d71129736d31c33b3ef5e442
font_01_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 10908 bytes
SHA-256: 1f0123f8e88f24f64e78f10aef211bebc43f7fd51d19689f6f3f714336861713

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