Malicious PDF — malware analysis report

Static analysis result for SHA-256 917cf35fe4ac09a4…

MALICIOUS

PDF

77.4 KB Created: 2021-04-15 22:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6318f6669213b25d5092cc53ae844864 SHA-1: 3f5595db86c54c2e38f49c8e5ace6b4d3dfa4f94 SHA-256: 917cf35fe4ac09a4632e5ba4d70d939df753f3494017f7d26dca88b0d28bf50e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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=when+you+love+someone+lyrics+lukas+graham+chords PDF link annotation
    • http://stavki-na-sport.site/which_sentence_is_an_example_of_faulty_coordination_running0zolx.pdfIn PDF document text
    • http://raftgjgr.space/calculo_de_area_integral_definida_exercicios_resolvidosthphy.pdfIn PDF document text
    • http://life-news.tech/23978599034zbea0.pdfIn PDF document text
    • http://autoupgrade.website/ewi_5000_vs_4000spu6h6.pdfIn PDF document text
    • http://biomaniks.website/the_little_prince_quotes_about_numbers72o6l.pdfIn PDF document text
    • http://tpdreport.com/a_fish_in_the_sea_book_summary87ao5.pdfIn PDF document text
    • http://tipijijajofupi.sportsontheweb.net/tv_channel_price_list_2020.pdfIn PDF document text
    • http://zedateve.mypressonline.com/ascaridiase_biliar.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/kenmore_sewing_machine_model_158c9sey.pdfIn PDF document text
    • http://com-servers.online/gobikebulavegadusina1u0x6.pdfIn PDF document text
    • http://cartest.pro/68270666581a2v3j.pdfIn PDF document text
    • http://train-home.ru/linaferedoxowlbr3n.pdfIn PDF document text
    • http://ridunculus.com/bulanupadiferabezrat0g.pdfIn PDF document text
    • http://wersita.fun/2007_chevy_silverado_1500_factory_service_manualy0s6a.pdfIn PDF document text
    • http://gooddevice-online.com/brian_tracy_eat_that_frog_videolyjvn.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/5178546509.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/8ca2c05c-455c-4e84-99b9-924d39f7ac14/educational_psychology_jobs_in_south_africa.pdfIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/67507549649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4073ac-2f1f-4052-9a3c-0494067766ff/23533389481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0824e572-d8ab-4695-997c-7c4bbb04d78d/36180059238.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_off0000ee44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE44 5592 bytes
SHA-256: c922e5b4d4c0da73822b0a22ee9bb40e60b35b89e972097d9f6735d014108a9b
font_01_sfnt_off00010135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 10612 bytes
SHA-256: b109f82e8957277d184c94496db6270c3de64a163bc001f8be7b872389f924b2

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