Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b2af59067235ea…

MALICIOUS

PDF

81.0 KB Created: 2021-04-13 16:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3dd6ab5014f9bcfc9465282bb42c6f3e SHA-1: 7a35eb58e4b9bd137977f7ff4c37a8dc3f199517 SHA-256: b0b2af59067235ea0f8fccef9845537ef018110b49172c3483923a4c575bf21c
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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=structures+or+why+things+don%2527t+fall+down+wiki PDF link annotation
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494435/normal_5ff1d526041ba.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/reduce_file_size_online_1_mb.pdfIn PDF document text
    • http://haustova.com/sohcahtoa_word_problems_worksheet_with_answers6vffv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_60326cbd7e7d8.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/Oif3jaP/capsaicin_cream_brands_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/tudenireso/XGagh3A/cloth_mask_diy_no_sewing_machine.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/69693220084.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368495/normal_5fc850bc18012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5fd11cae7d32a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_605e0b8ad91e2.pdfIn PDF document text
    • http://ighelperscenter.com/how_to_print_black_without_color_ink_brotherh7air.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/icxKJXU/unnatural_history_tv_show_watch_online.pdfIn PDF document text
    • http://confirmationhelpcenter.com/kakolefijokibokunupab4apfe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vajefam/bharathi_kannamma_songs_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/serato_dj_lite_settings.pdfIn PDF document text
    • http://tevaluzax.atwebpages.com/basic_principles_of_graphic_design.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/dota_2_roaming_support_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/anandamela_pujabarshiki_1426_free.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_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 5676 bytes
SHA-256: 61d3609256a98f0d10503159d4704bbc82cafc6ae64f7e2165b84656f5161291
font_01_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 11584 bytes
SHA-256: 904b9cb0757ea166c6d4fb281c909f3db3c28d0218921091ea82d86a6355c7df

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