Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a36f85ab21c2ab…

MALICIOUS

PDF

71.9 KB Created: 2021-03-23 03:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8d1cd011372985004c1409e7f2365d08 SHA-1: 310f0f312aa4ddc7add0556f63af7d36d36bbd97 SHA-256: 84a36f85ab21c2abe384552d7cada0ecf512161866d2e2b0ff3b56ff3ec235f2
156 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 0.9996

Heuristics 5

  • 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.
  • 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://resalured.ru/strik?utm_term=autocad+civil+3d+2018+training+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/zowonefaso/jgijTZ9/gugigud.pdfIn PDF document text
    • https://cdn.sqhk.co/sudidoxa/Ygdhgjg/zasimupuxiluleselusoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/RjbigJl/city_car_driver_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/emijSjd/80979012956.pdfIn PDF document text
    • https://cdn.sqhk.co/remozemot/2chgifg/vetoxidalu.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/d72cab28-dd7f-4e9c-be2c-bf2f2fa04346/what_is_meant_by_knowledge_work_systems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780db55a-f6b3-4bb4-9b0c-0f1c220e3ac2/how_much_is_doordash_worth_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98256b9f-6820-4946-aa76-86162bfed9b9/47464550051.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_c3a8066037914325a8acf60e99d52a5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4618a2e-6c10-4d4c-9c47-dfb621162d58/what_is_the_climax_of_the_tale_of_peter_rabbit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd1ad07e-2a76-4ff5-85c4-800db172f7a0/what_is_the_average_salary_for_a_phd_in_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c2125f-3239-487a-a9e0-f0711e12707c/which_is_better_single_phase_or_3_phase_power.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/free_editable_indian_wedding_invitation_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a319649b-2c0f-44ef-a12f-b1bbea73ed75/the_living_christ_tv_series.pdfIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_39979f6892a64c1899f37c05281a622f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef61a008-c831-42c4-8569-686534480de6/how_to_design_concrete_formwork.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_c2518560b6bc402d9be0a62219ed6df8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f42dfd93-5f0c-4bae-b772-7b902bd1fb19/how_to_harvest_a_peanut.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/fewomomepo.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_fb284bcb4489438fbec23741fa0044e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/how_long_do_gmc_envoys_last.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_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 6028 bytes
SHA-256: 143d59ff0683230ae5867b74d49884e2501664ff33571c939a0ec483ff042343
font_01_sfnt_off0000ed13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 10376 bytes
SHA-256: 2c9221c79f5b89c24222728111fa337c020b5951592729d153a26136e469ebd3

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