Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0b5c737fa725f7…

MALICIOUS

PDF

75.0 KB Created: 2021-04-05 14:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6461c006ae22223edb701eea5b30ae41 SHA-1: d2223a41e0acfe23c7b07541ec51c9f6795bc473 SHA-256: 8f0b5c737fa725f7508abbdcaa9a2ba03d1f4daea8ade093a0617cd2f3cfa750
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/award?keyword=interview+skills+tips+pdf PDF link annotation
    • https://cdn.sqhk.co/fusojafiza/6JYhjja/64471141436.pdfIn PDF document text
    • http://petrol-v-pol-price.site/idfc_mutual_fund_fact_sheet_may_2018mi3xy.pdfIn PDF document text
    • http://vuvuga.xyz/zaliperegap6vs9s.pdfIn PDF document text
    • http://chisto-chisto52.ru/vocabulary_builder_a_more_perfect_unioncrj7c.pdfIn PDF document text
    • https://cdn.sqhk.co/likamigid/ifggYC6/worksheets_for_ordinal_numbers_grade_2.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/MIhg2bC/wiwububalir.pdfIn PDF document text
    • http://hookup755.fun/bajar_pelicula_el_conde_de_montecristo_en_espaolrdno6.pdfIn PDF document text
    • http://kmplitka.shop/glencore_plc_annual_report_20169nyy1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/966ec9f8-d9a2-4b4f-a754-ae725ef3feeb/new_dance_group_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9842e953-a12a-45d6-832f-a022812d85f6/45044803862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4141591e-e299-47e0-b571-bb814f56d878/toro_super_blower_vac_manual_51591.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_a88fb326ea92400c8d22c8e40d95de12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a0a925-35dd-43d5-8d85-53e21876a088/26887656507.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_b9815df3e00d49a0ab690b2aad364316.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e382ecf-41f6-4e43-bb7c-84a697955386/mujikofixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541a1df3-6a73-4eb2-8158-e7c6b772613d/24_day_challenge_advocare.pdfIn PDF document text
    • http://bosurigazo.epizy.com/personal_branding_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7beac34-7886-4187-af82-836ace79fdce/75507901345.pdfIn PDF document text
    • http://mowoled.epizy.com/sat_math_syllabus.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_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 4976 bytes
SHA-256: 1179476140a13cf18e4814abc77c80e34d97ee74f95cae53351b8eae41c2a8e2
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 10804 bytes
SHA-256: 48e5edfefa4904bd9f1b37542a15a1c9ff1ce2699c9f50901131966d68ee1b35

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