Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57e441818b8d3d1…

MALICIOUS

PDF

76.6 KB Created: 2021-04-20 06:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6f410aa1b06709fc9000ffaf8616c576 SHA-1: a8e266336ce40b995bc6d651465d986d5de4db1b SHA-256: f57e441818b8d3d1ec00cd6b851047ebf37a08f699b166774dd3b2e03521dcd1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lead users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=what+is+constant+heartburn+a+symptom+of PDF link annotation
    • http://luchdobro.site/panda_pop_2020snnh5.pdfIn PDF document text
    • http://gatofupimekow.mywebcommunity.org/school_bus_coloring_page.pdfIn PDF document text
    • http://pay-order.info/40780803797yoymp.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/89226957076.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/trade_in_evaluation_form.pdfIn PDF document text
    • http://rubka.space/38283592658x93t1.pdfIn PDF document text
    • https://silemixijotin.weebly.com/uploads/1/3/4/4/134463531/xavotakivivo.pdfIn PDF document text
    • http://dinetaki.22web.org/mfc_8710dw_wireless_setup.pdfIn PDF document text
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/bunivafipes-sawabaxixiw.pdfIn PDF document text
    • https://dojixevagix.weebly.com/uploads/1/3/2/6/132682303/gusegogedali_mimebiserusofet.pdfIn PDF document text
    • http://ita-women.space/582919482289qr0m.pdfIn PDF document text
    • http://zuwaweno.iblogger.org/5377265506.pdfIn PDF document text
    • http://rimarilomikozu.medianewsonline.com/engineering_materials_1_michael_f_ashby.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pizubape.rf.gd/greenwich_ct_hourly_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/cfm_full_form_medicine.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/37261377155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4320198a-d28a-4221-9439-4c7d6c9aeeaf/how_to_clean_dyson_vacuum_filter_v7.pdfIn PDF document text
    • http://koxoxitukemanaj.epizy.com/11914135570.pdfIn PDF document text
    • http://poxizaxo.epizy.com/classification_of_animals_worksheet_for_grade_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/393e11ce-98d5-4214-8e22-60d42cac1f25/dd_player_sheet_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3ab462-b5b7-4329-8c12-4b0684711300/english_conversation_practice_by_grant_taylor_online_read.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1934895e-b50c-4a35-993b-43599a9b7967/gonizufirusaju.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_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 5480 bytes
SHA-256: 6c5ebae1e910e1fad0bd30eafd1cd70d9e37694a1eacacc282a272178c6e48c5
font_01_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 10392 bytes
SHA-256: 365d3a7598f9bbc6203c8fc7ffff6cc2bc3a91e2cefdd8c05c5888071887008a

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