Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6d5ff6dab40f79…

MALICIOUS

PDF

95.7 KB Created: 2021-04-06 16:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b670839fc6ad64eda16f94bad31aa22d SHA-1: da790f56f6c95a5c4f0c4b5655f5b4c043c99795 SHA-256: bd6d5ff6dab40f79e0e6e4c1f28b15463015b169b164ce0acaa46890593b1725
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 0.9998

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://golowaki.ru/123?utm_term=arellano+university+mandaluyong+uniform PDF link annotation
    • https://cdn.sqhk.co/tofigidukug/DhaqjiV/anorectal_and_colon_diseases.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/rggghjg/60357625.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/gigrhg2/slack_download_ubuntu_terminal.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/jugekumogaxoko.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/jiketedoxefewixoxu.pdfIn PDF document text
    • http://viwoxavufonodu.22web.org/home_rent_agreement.pdfIn PDF document text
    • https://cdn.sqhk.co/monubinejon/gjaifdl/varillas_de_radiestesia_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_30027b8490634a429ded2f72ba13fe0a.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_fc7f51c3265441c9871156d87af0c1f6.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_1786c831295643d29a431ade1be18b8f.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_e69db5304b1c4419b983587073b25f58.pdf?index=trueIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/modelo_de_base_de_datos_orientado_a_objetos.pdfIn PDF document text
    • http://wurozuvejesubot.epizy.com/249372822.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/from_dusk_till_dawn_quentin_tarantino_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/gusawuvunexu.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/the_ancient_magus_bride_ep_7_vostfr.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/information_about_computer_components.pdfIn PDF document text
    • http://kinuvafarugabob.rf.gd/plant_and_animal_cell_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/fiwukufalukonedodiman.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/galiwawewotowa.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_off0001365f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365F 5380 bytes
SHA-256: d267925588d6047e51bd3042bd831a27eec65841376b26acec1734575c60963a
font_01_sfnt_off000148a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A6 12560 bytes
SHA-256: 01d4fd864f248f521ec4123ab189901bfbb314c86fe6366304f2a899883dc0cb

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