Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db6b0a820257789…

MALICIOUS

PDF

77.1 KB Created: 2021-06-12 01:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 11e360e826c0311290ef5ad78d7b9e13 SHA-1: 0ac2c9102e7f79cb8481ede462cb2601f6c11f5e SHA-256: 1db6b0a820257789061c1cf9f873f47843097147d069b44d1a47c8561a447958
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/pbw?utm_term=mahishasura+mardini+stotram+lyrics+in+malayalam PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385636/normal_604d6314296bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460251/normal_60bd3d97183b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502906/normal_60ba9452a80ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408476/normal_605d39cfabaa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_6029b03725f16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421462/normal_60039823d84bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_604d1b5a881d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480897/normal_5fe13d7441c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_600b4c900dac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_606bcacb787b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474457/normal_5ffd66637c8bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nalujoxerisi.pbworks.com/f/pioneer_avic_f930bt_factory_reset.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/gelukewopototorofifatu.pdfIn PDF document text
    • http://lojefizowoj.pbworks.com/f/hoffbrands_essential_haematology_7th_edition_free.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/how_to_write_twenty_hundredths_in_decimal_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d46027-5382-4506-92b0-a49db77f3600/siemens_hearing_aid_service_center_in_delhi.pdfIn PDF document text
    • http://kukumepubop.pbworks.com/w/file/fetch/144819366/romeo_y_julieta_libro_resumen.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144424632/hoi4_uk_multiplayer_guide.pdfIn PDF document text
    • http://degenazi.pbworks.com/w/file/fetch/144661227/aramco_approved_vendor_list_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8493c20-2154-4bf4-bfc2-fc785355963b/the_visual_basic_.net_programming_language.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/answers_to_trail_into_darkness_commonlit_answers_quizlet.pdfIn PDF document text
    • http://madatev.pbworks.com/w/file/fetch/145161930/santa_claus_envelope_template.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_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 5284 bytes
SHA-256: b94b993aaf66fdda66188d81b92a0600937694d94a8a5c7f9f5bd6e7d037f7b2
font_01_sfnt_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 10872 bytes
SHA-256: f5caee2698aa6c7bfbcbcd2f8ef5b0eb47a3567cfb1d0cbb8af5e3c028a85a66