Malicious PDF — malware analysis report

Static analysis result for SHA-256 b022d4b6aae77496…

MALICIOUS

PDF

76.2 KB Created: 2021-04-18 20:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 808b778368260fceffb85ebdc244311c SHA-1: 14ddc1d34803b42166f9f431c461d57a7bb4efac SHA-256: b022d4b6aae77496514282e5cc7457c0cc9333fd7138fe45f1e7443b4a976d75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. This suggests the primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/strik?utm_term=monster+trucks+movie+parents+guide PDF link annotation
    • https://cdn.sqhk.co/wepurodapike/8uIrgdY/the_stock_market_game_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/3jbjejb/40724195362.pdfIn PDF document text
    • http://tixshopclub.fun/bsc_physics_mechanics_notes8n9c6.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/hdjbNhc/lumopojexu.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwebuvowo/WWjgDjg/war_conquer_games.pdfIn PDF document text
    • https://cdn.sqhk.co/zetobazox/aPUfOgg/shopping_iguatemi_brasilia_horario_de_funcionamento.pdfIn PDF document text
    • https://cdn.sqhk.co/dasupejej/hgifKje/nofifusikusipabupote.pdfIn PDF document text
    • http://chatik85939775.fun/16898038711hnl6f.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/gdhblVY/women_s_soccer_championship_2019_tv_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/8tgdFbh/gedumegamabokures.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/iagfiag/sound_equalizer_ios_app.pdfIn PDF document text
    • http://detonic-ordina.website/lanawalonirn90b.pdfIn PDF document text
    • http://devedilazabu.medianewsonline.com/new_fairy_tales_in_tamil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/ragatidejojezew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4c733f8-00f9-4f47-a258-a50e9cb1ce5a/child_of_god_movie.pdfIn PDF document text
    • http://xifabemifuxiza.rf.gd/lenovo_thinkpad_t420_battery_price.pdfIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/quantitative_research_questions_about_covid_19_pandemic.pdfIn PDF document text
    • http://lejaxofin.epizy.com/besilinazasigar.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/sepujedawowesusovikekapet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c89c2b-3051-4949-9efa-5cc02d5ddf8a/dogexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a5d036-eefb-47fc-a313-b6f756d5c35f/vuzesolupunuv.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_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 5492 bytes
SHA-256: 75d8332b682cbdbfa3a9162f7913ad37e0aeca688856567fede15bf94999efdb
font_01_sfnt_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 10936 bytes
SHA-256: 8e816dbeb0995f0498729fb1d77be54bc5e034f81b313438cd8ecadba9b7de43

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