Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7fa0c589c8cde1…

MALICIOUS

PDF

72.2 KB Created: 2021-05-09 04:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 806777b5a4b35fd19f6d474e6d46455d SHA-1: c8284660cc8e9956881d7b09709134562f031dba SHA-256: 5b7fa0c589c8cde180f289e8c3c30912785189357cf43558566aad4eecdc8f2c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates a potential tracking or redirection mechanism for malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=brinkmann+medallion+5-burner+gas+grill+parts PDF link annotation
    • http://ribadubeko.scienceontheweb.net/53060450570.pdfIn PDF document text
    • http://italywow.info/74211701114x6kyw.pdfIn PDF document text
    • http://naykaryadom.fun/fubupokipa1huim.pdfIn PDF document text
    • http://sarhello.online/applications_of_artificial_neural_networks_for_ecg_signal_detection_and_classificationsp43u.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/kerupivipuzonis.pdfIn PDF document text
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/869953f73.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/29_cfr_part_1910_occupational_safety_and_health_standards.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/delhi_road_map_with_distance.pdfIn PDF document text
    • https://benerema.weebly.com/uploads/1/3/1/4/131408328/xisilamirawu.pdfIn PDF document text
    • http://duzixofiwisegi.mygamesonline.org/jetexatu.pdfIn PDF document text
    • http://onenature.space/looking_billiards_city_mod_apk_android_13aye1.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/advanced_excel_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurabagoderes.atwebpages.com/jezonamita.pdfIn PDF document text
    • http://fegoluvarelewum.myartsonline.com/barbatimo_bula.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/cisco_ccent_certification_study_guide.pdfIn PDF document text
    • http://xidalagep.myartsonline.com/cancer_de_mama_minsa_peru.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/capture_screen_android_xiaomi.pdfIn PDF document text
    • http://zimopup.myartsonline.com/basic_elements_of_graphic_design_and_layout.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/what_caused_the_neolithic_agricultural_revolution.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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 5688 bytes
SHA-256: 9dc3035d2a2b9d887c48df1cd01fba588de5966e577ef12fabf5356a4c744665
font_01_sfnt_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 12116 bytes
SHA-256: 1f09e8819f69428792e49c051e1386a367ad81af0587e7b8751799a1925dbccb

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