Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca99ff53f7ec0d9a…

MALICIOUS

PDF

74.1 KB Created: 2021-03-15 00:08:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0fe5d92722638744539274484b149072 SHA-1: 591d7a24f830be92b7dce598516a3866f971d540 SHA-256: ca99ff53f7ec0d9ab3960ea64d59185c2d02bde6dd4aea373c46a829552fa191
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9997

Heuristics 5

  • 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://soxebez.ru/wix?keyword=amoeba+sisters+human+body+systems+worksheet+answers PDF link annotation
    • https://jobemorisawelav.weebly.com/uploads/1/3/4/1/134108772/7267643.pdfIn PDF document text
    • http://blockhcain.host/fogumitobeguwiijgyb.pdfIn PDF document text
    • https://gisijenoxumo.weebly.com/uploads/1/3/1/4/131437849/94c378.pdfIn PDF document text
    • http://xapizokawe.iblogger.org/the_hollywood_reporter_next_gen_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/sanobude/bighaji/91948645402.pdfIn PDF document text
    • https://cdn.sqhk.co/tedavevata/5yChixh/avantasia_the_metal_opera_part_ii.pdfIn PDF document text
    • https://dudunetexuzo.weebly.com/uploads/1/3/1/3/131379759/8300806.pdfIn PDF document text
    • http://mobile-media.moscow/ejercicios_de_trigonometria_de_1o_bachillerato_resueltos07xsh.pdfIn PDF document text
    • https://satemegozujig.weebly.com/uploads/1/3/4/4/134477909/16247.pdfIn PDF document text
    • http://robertferrell.net/straight_through_cable_color_combinationzfw1z.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/dIHjdgd/65818896363.pdfIn PDF document text
    • http://spiritstudio.ru/raxolikeloziwjwtw0.pdfIn PDF document text
    • https://zagukosi.weebly.com/uploads/1/3/4/3/134314994/2e1025f4.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/povodijirig/ultra_viewer_latest_version_free.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_e10b047035b348868fdefbb005caa16b.pdf?index=trueIn PDF document text
    • http://dukifubu.epizy.com/classic_car_value_guide_australia.pdfIn PDF document text
    • http://pabaxekuvo.rf.gd/continents_and_oceans_worksheet_ks1.pdfIn PDF document text
    • http://wumimed.rf.gd/jonavazesipojidedofigid.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/incident_management_process_document_template.pdfIn PDF document text
    • http://zujopafupo.epizy.com/61778296408.pdfIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_dae6ba642e164657a573761f972d10c8.pdf?index=trueIn 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_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 5420 bytes
SHA-256: d1674dc3096cd7a26e888212582a3a3d8ba844c6f82d5cbd6cec37e783489673
font_01_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 10880 bytes
SHA-256: 04dfebb5545f862c913c65ec234b176e8035fac83f897176bf5f48b6511d91e5

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