Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6c42cca0a83f85…

MALICIOUS

PDF

132.4 KB Created: 2021-03-13 14:36:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 19feb964b5089464feea76b96a9813a5 SHA-1: 383119487904579a89e686dd88159f6dfde7cb1d SHA-256: 8d6c42cca0a83f853504828e628c580b18856f7b3f522663837ec01311f4e834
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=mild+mental+retardation+pdf PDF link annotation
    • http://infokurs.design/uclear_hbc200_manualdii3j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418788/normal_6029d26818978.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/Mje8IXs/noguvisevixepo.pdfIn PDF document text
    • http://infonewstravel.com/riviputapaximuemke7.pdfIn PDF document text
    • https://cdn.sqhk.co/bowevuva/fjiduva/xcom_tbg_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472495/normal_600334915f1af.pdfIn PDF document text
    • http://naturwows.space/law_of_conservation_of_mass_lab_reportkoh76.pdfIn PDF document text
    • http://sehq.xyz/58487140563oejxq.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/15e77e45-6fdb-4613-bd38-5656353221f3/poisson_process_example_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2fe2cd5-a946-4592-b43a-57d97c6e9228/is_lattice_energy_usually_endothermic_or_exothermic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f82cff-8989-4f65-9256-c46abd63cebc/lexus_is_300_awd_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/bootstrap_file_upload_example.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/excel_calendar_2019_one_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a5fc2b-9033-4fb3-9854-7d4a28f028b0/how_to_read_tab_notes_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/8701733189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2074f81d-6e42-42df-8b65-20fd7e303d30/hp_elitebook_8560p_ethernet_driver_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce00f1ec-86a7-4fa8-8b5f-2731d6be0515/5360594781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f76676-037f-4738-912d-200777b94793/redhead_gun_safe_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ef68ec-f70f-46ee-977f-7716058a90db/change_your_thoughts_change_your_life_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd254fe5-ee1f-48c4-a7b7-4bb29d0fffe5/dell_latitude_e6410_specs.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C50D 5012 bytes
SHA-256: b8ac7be96a04d80e040d59d27a4789429cf3b78575e56e6a93a49fb03047cf8f
font_01_sfnt_off0001d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D60B 14516 bytes
SHA-256: cb85d406a445f7e01041ef9c986aafe21901d1d004771ffeb48b3f527a662251

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