Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bfc6dd09e7d15f…

MALICIOUS

PDF

108.7 KB Created: 2021-03-17 14:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 294522135d85540fb72dde255ea597c1 SHA-1: b891150860744cd9a504b84ee72a3f88e6ed88af SHA-256: 23bfc6dd09e7d15fd0628815d7c6486c51fd96b88fa3dcfbfe6805bdd82aa690
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and one specifically identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=rsi+handpunch+3000+manual PDF link annotation
    • http://save50it.pro/25661254251fg7fs.pdfIn PDF document text
    • http://ekzo-fruit.ru/life_and_death_stephenie_meyer_quotes5lhcp.pdfIn PDF document text
    • http://tonerinkstore.com/new_home_search_checklistnznnw.pdfIn PDF document text
    • http://smallita.space/traditional_chinese_medicine_free_downloadb6xyq.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/jbHdVk2/traductor_idiomas_voz.pdfIn PDF document text
    • https://cdn.sqhk.co/bobimugura/oidlOih/50437210897.pdfIn PDF document text
    • https://cdn.sqhk.co/muzolorakow/Ugifbje/download_backyard_baseball_2001_for_scummvm.pdfIn PDF document text
    • http://harmony-market.ru/689442971678w6vl.pdfIn PDF document text
    • http://libertinemodels.com/746281772427a2nn.pdfIn PDF document text
    • http://save50it.info/fazoluxy8oz.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/tjjghge/rituku.pdfIn PDF document text
    • http://arfesopt.com/29859303913n1ro9.pdfIn PDF document text
    • http://razvivatel.blog/math_olympiad_practice_problems6q56d.pdfIn PDF document text
    • http://stavki.link/samsung_un65hu8550fxza_manualipv1x.pdfIn PDF document text
    • http://yarrebitteh.online/369611876928ke4w.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/jijatfR/music_quiz_guess_the_song_answers.pdfIn PDF document text
    • http://salonapp.xyz/how_to_wrap_present_with_thin_ribbonqbtqx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_275ce4eb4cc34d91be3b339a78991eb7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemazun/fufegog.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/sig_sauer_mosquito_22lr_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/kitten_care_guide_8_weeks.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/kigejufedexoruras.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/state_of_texas_employee_tax_forms.pdfIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_c42c92d6bc9c4185aa1fd6c16ebb1c92.pdf?index=trueIn 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_off00015fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA4 5532 bytes
SHA-256: 9ba056d5d49854ef90d50001b96b6bf33d28353a09f9bf3e67131cb87abea405
font_01_sfnt_off00017250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17250 15304 bytes
SHA-256: 738588960f1c309e0afc66ec0d2550de8ebc200ab6989c57e79e75bbd7869050

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