Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e189c808eb79e9c…

MALICIOUS

PDF

70.7 KB Created: 2021-02-18 03:13:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 525a81d03d666e4f0e1e8a8f66683e53 SHA-1: 9af21f3d5d6b4951fd7604ed2b7267ec9a8ac5a5 SHA-256: 3e189c808eb79e9c332900353f7ba5900328e2b5f6f00f2f4810a48025f72c62
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a background check service. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

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://jacksth.ru/wix?keyword=boyfriend+background+check+uk PDF link annotation
    • https://jasugupaxawuz.weebly.com/uploads/1/3/0/7/130740610/pizorelukidub-borofupezikinu-zinupa-xodika.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/zifoxerexa.pdfIn PDF document text
    • http://vezokikawelin.iblogger.org/catenae_innovation_annual_report.pdfIn PDF document text
    • http://stat-index-co.com/logic_puzzle_puzzle_baron_answers0s7ja.pdfIn PDF document text
    • http://topshops.website/how_much_does_it_cost_to_start_a_video_production_companygntwn.pdfIn PDF document text
    • http://maxist.ru/omron_h3cr-f8_manual_espaolhvt1m.pdfIn PDF document text
    • http://fulitip.iblogger.org/free_powerpoint_templates_for_business.pdfIn PDF document text
    • http://fisutef.iblogger.org/hey_mama_variya_song_masstamilan.pdfIn PDF document text
    • https://povilaromegew.weebly.com/uploads/1/3/4/4/134486615/kipidef.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/vuzufexarevima/vaketedogagipevexa.pdfIn PDF document text
    • http://sarozaxag.epizy.com/colony_comparison_chart_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/present_perfect_and_past_simple_exercises_worksheet.pdfIn PDF document text
    • http://mugijuzes.epizy.com/cdc_group_annual_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/guxipunutusudafokopotari.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/25118785939.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/1021311887.pdfIn PDF document text
    • http://jedasuzafofirif.epizy.com/latanedinobu.pdfIn PDF document text
    • http://bepibuxel.epizy.com/does_walgreens_have_a_24_hour_pharmacy.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_off0000d897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD897 5428 bytes
SHA-256: 2b95a3ef8a0b530c2826c4c8922db5e27d0fda7af38970ecdf462b6654bb3114
font_01_sfnt_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 10244 bytes
SHA-256: df6d16861f1649a6a7736512decabe9c2e4850c46571dd0695a12aafbefe0b35

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