Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a7b8b123c4ae9a…

MALICIOUS

PDF

80.3 KB Created: 2021-02-23 18:26:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 95a59dce197386d530f8770badf3a99b SHA-1: 991f9c6c011062d4453fee4b325969d5b30f11a0 SHA-256: 07a7b8b123c4ae9a9a2d82226bcbdaa4a1512098dea8936cdec58dad091adc86
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure strongly indicate an attempt to lure users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=5e+expanded+equipment+list+warlock PDF link annotation
    • http://umniashka.ru/34562295462gzg6j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450628/normal_5fdc195fc1f70.pdfIn PDF document text
    • http://topfrag.rip/pdf_daily_toilet_cleaning_checklist_excelkvwgh.pdfIn PDF document text
    • http://jsexj.fun/the_food_vocabulary_word_game_answers_1731fv7c.pdfIn PDF document text
    • https://cdn.sqhk.co/vedisaso/inhiPAv/58731892457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458856/normal_6027f481da380.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/rvv9Sjj/transformers_earth_wars_omega_supreme_unlock_grapple.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405409/normal_5ff07d8f0cae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_6030d72ebfad2.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/d1jcgFN/cars_colouring_book.pdfIn PDF document text
    • http://svoydvalend.xyz/what_foods_lots_of_caloriesf2dcn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445573/normal_602b8d7aa7fe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_601ac5f163951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_601a70b432714.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/idWTjgW/cake_recipe_from_scratch_no_eggs.pdfIn PDF document text
    • http://reestr.site/168469522719wbb.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/idjbUqa/can_you_grow_credit_score.pdfIn PDF document text
    • http://itsamorem.com/ele_shaman_stat_priority1u6yy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 5600 bytes
SHA-256: 49de66ea434cee12fdcf481f6dd9b68e692828b8b2632d47bdbd2326df7baf63
font_01_sfnt_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 11320 bytes
SHA-256: 39f305a3e00f13f6cf4f51a404261bc3d11ad960a7fa1e574492444222c94520

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