Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54a3dea946021d6…

MALICIOUS

PDF

98.1 KB Created: 2021-03-17 17:18:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 157ea471088725e783eee4778e034fb5 SHA-1: 9317614ba0f3341cda639e8c220ae93cde3c6631 SHA-256: e54a3dea946021d62ef672e01e1c76b0c872f97e6c78f4e2ec8c69b74643f131
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 0.9981

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://gimoguvi.ru/wix?keyword=happily+ever+after+kiera+cass+read+online+free+pdf PDF link annotation
    • https://cdn.sqhk.co/xasexuwosul/KdibjfF/hitask_manage_team_tasks_and_projects.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/Ijejfha/platypus_evolution_crazy_mutant_duck_game_schedule.pdfIn PDF document text
    • http://xteenware.online/bise_grw_11th_result_2019_gazetteifyno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_6009c280ee1fe.pdfIn PDF document text
    • https://gewipilozu.weebly.com/uploads/1/3/0/7/130775211/kuripilowijatisom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_600ea3bbe5dcd.pdfIn PDF document text
    • http://fastcreditcheck.info/83654530897p7pqx.pdfIn PDF document text
    • http://vir-tus.com/how_to_address_a_navy_chief_warrant_officer01obz.pdfIn PDF document text
    • https://tewabigonin.weebly.com/uploads/1/3/4/7/134760563/8539064.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490273/normal_5fece61758f5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530990/normal_6007b529e2ec8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479224/normal_5ffd49262eb39.pdfIn PDF document text
    • https://satisetuxa.weebly.com/uploads/1/3/0/8/130813646/16ec01c53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485800/normal_60209023c3d64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487187/normal_604664f5432e0.pdfIn PDF document text
    • https://wawokosekipazas.weebly.com/uploads/1/3/1/4/131452886/toxese_tilut_ralidorame.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/hbhhigZ/good_harvest_market_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5fd5ff97bc79b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/789483cc-c846-4b2b-aec0-58760e10f435/92621915551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7801268-dce9-4049-acd3-38eec3d71181/staff_nurse_entrance_exam_questions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc8cb7d-9190-40f8-8b96-30bc721aa026/suxopuwiwarisivebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee569a37-c6e3-46e1-895a-633c6baac7d3/miwisuveri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faab5878-8da2-4502-859c-8b528a9fd993/10_tips_for_building_healthy_relationships_in_early_sobriety.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 5124 bytes
SHA-256: 2f783d07422fe4bbb0c82b5ab1e20a13a6ceb57fa45420c497c79a2339172bf7
font_01_sfnt_off00013161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 10980 bytes
SHA-256: 676b8519febb11eecb0ea3691dc57f5d945604ec13f1d70f37db2e6b41d97a8d
font_02_sfnt_off000156bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BB 16204 bytes
SHA-256: abfd345a6ea1e62b83e5b81470e97c0bb38d81b9d626d8407e597eb2d2192f0c
font_03_sfnt_off00016c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C0A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3