Malicious PDF — malware analysis report

Static analysis result for SHA-256 201cb457bbd98cbf…

MALICIOUS

PDF

82.3 KB Created: 2021-03-25 08:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4b119c8b847ea149e446e1ea83ea40f8 SHA-1: 9b52db582788a03d5d0dde676853dab2dff79998 SHA-256: 201cb457bbd98cbfd6c14287ee835f6802854b3f9f5b46bb9f76ab4b5a02a460
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 0.9964

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://dafemum.ru/award?keyword=risk+averse+investor+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477367/normal_5ff9628aec570.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/jDjijhS/husky_simulator_noetic.pdfIn PDF document text
    • https://cdn.sqhk.co/vuranataxu/giFhfri/98272444185.pdfIn PDF document text
    • https://cdn.sqhk.co/kagitenoru/Frhf0ic/gifogoruzitonafepobapin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454052/normal_60078db07d1f5.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/rowutamirekimemege.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/SieD3dA/95000706083.pdfIn PDF document text
    • http://fadewujetenuve.mywebcommunity.org/74774881947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_601b66468bfe8.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/walaluxexolimo.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/burnout_estrategias_de_afrontamiento.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_6031d043be7ca.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzevunoxina/ggjhdkF/customer_journey_map_template_sketch.pdfIn PDF document text
    • http://zunololanuxigu.sportsontheweb.net/vicks_cool_mist_humidifier_liquid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393901/normal_6022c80b4c269.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/puxowabegolizatekanemu.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/how_to_put_ink_in_hp_deskjet_2545.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vukimikopid.epizy.com/nawinopafex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb828360-ee21-4f32-9699-99af0fad9893/votabufiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a04771f-5dd8-443f-9816-ef4ba6933678/samsung_note_20_release_date_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d867080-2cc7-4c6c-80b7-2021f8809fef/where_is_the_filter_on_my_samsung_top_loader_washing_machine.pdfIn PDF document text
    • http://xasepeza.rf.gd/austrian_embassy_visa_application_form.pdfIn PDF document text
    • http://tijiwef.epizy.com/realidades_1_capitulo_2b-_8_crossword_answers.pdfIn PDF document text
    • http://liruvumud.rf.gd/digimon_story_cyber_sleuth_digivolve_guide.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/kad_emule_lista_aggiornata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/940e952c-3555-440e-9e7d-f5c1fee727f9/53298625987.pdfIn PDF document text
    • http://lepalatibig.epizy.com/xagavotesuwo.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_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 5136 bytes
SHA-256: fe76c8db09c6631704ce51fed8dca6a178a3b668b7db9b84bf3585877833d36c
font_01_sfnt_off0001143b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143B 11144 bytes
SHA-256: 747bcef89734ffe1ea3140063369519d1d378818a019fded32859948ed139494