Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c94aa7991adbb7…

MALICIOUS

PDF

72.0 KB Created: 2021-03-12 20:28:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 166faa18b5663138e41ad3ddadb69eb2 SHA-1: 43484edd996f38db3950e39b7eb386fe9aca67ce SHA-256: 41c94aa7991adbb73e1ab2745f5af53a5032104bf8e2e5ceaa9d241eb0755b32
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 high-confidence ML classifier and ClamAV, indicating malicious intent. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a creation date, suggesting it was generated programmatically. The numerous embedded URLs, many using disposable hosting and UTM parameters, point towards a phishing or malware distribution scheme, likely disguised as a search result for a technical manual.

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://pelibifir.ru/strik?utm_term=panasonic+kx-t7633+manual+pdf PDF link annotation
    • https://makurabun.weebly.com/uploads/1/3/4/6/134651698/tedaza.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/celestron_nexstar_6se_telescope_bundlee16yi.pdfIn PDF document text
    • https://fofumizuzel.weebly.com/uploads/1/3/2/7/132740209/mixugaxeze_perad.pdfIn PDF document text
    • http://wersita.space/el_coronel_no_tiene_quien_le_escriba_pelcula_mega2156q.pdfIn PDF document text
    • http://zzzmmmmejjj.space/bemis_toilet_seat_manualu3wxj.pdfIn PDF document text
    • https://cdn.sqhk.co/manowipete/tjfjiih/metahuman_inc_wiki.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/0a50ed147d5e987.pdfIn PDF document text
    • http://chisto-chisto52.ru/303960558230u17i.pdfIn PDF document text
    • http://feedbacrnz.space/acca_affiliate_jobs_in_indiasoprq.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/resize_file_to_250kb_onlineou2yc.pdfIn PDF document text
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/ccb8c8ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385026/normal_5fe333a6657c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370740/normal_6006159d4544e.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/9xhfaic/tepizilomenonuze.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/9Kzfmgh/game_pigeon_sea_battle_layouts_10x10.pdfIn PDF document text
    • http://kino-vezde.ru/monitorizacion_de_los_signos_vitales_fundamentacionbak1w.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/jcggif7/the_hangover_4.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/36155334936d14s2.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/JjikRja/65513917845.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_6009a65906899.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_off0000db96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB96 5768 bytes
SHA-256: ff6502044be377e8686430f506d307584f4a0ec5a3881a8da413291d7d87f6db
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 10440 bytes
SHA-256: ac430f74516f0fe68e2739d0ba5cacaec6fbfea5795a708e1421eeede711393a

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