Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c2c0d80c9d2896…

MALICIOUS

PDF

85.0 KB Created: 2021-03-26 09:21:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3311a86e17384a55f0c2b89ab930cfd1 SHA-1: b57e8e8b663d681be86f3b69d439325990e3403b SHA-256: 18c2c0d80c9d2896e1cfa27f989f923e94cfd85d52949de5adf45f9065854153
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The embedded URLs are likely used to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://baarspo.ru/strik?utm_term=what+brand+router+does+centurylink+use PDF link annotation
    • https://lagomumudalo.weebly.com/uploads/1/3/2/6/132681699/3a1ae3af8998e92.pdfIn PDF document text
    • http://aycotoro0.xyz/elements_of_airplane_performance_g.j.j._ruigroksijdo.pdfIn PDF document text
    • https://kogozifimasubi.weebly.com/uploads/1/3/4/1/134131491/16f485e67.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/b5c6f816e85e0e5.pdfIn PDF document text
    • http://shtancircul.site/pavuzegegilodong01dz.pdfIn PDF document text
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/aaf201f58.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/zubafegogebojaxuxebes.pdfIn PDF document text
    • http://antinomi.design/642381328647ovoq.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/how_to_open_my_little_steamer_go_mini.pdfIn PDF document text
    • http://arthromedro.xyz/cara_block_pop_up_di_chrome_android18dt0.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/sawoxad.pdfIn PDF document text
    • http://cenderaoriginator.com/marksheet_formatcs87h.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/05a3b93f-bbf1-463d-800d-3e07d302eac8/personal_pronouns_worksheet_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0b450f-a0d6-4bd6-9a12-9098961e39ce/pesezewinumujibasi.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_f8b292b4a92f45eebbb7be2c1e9be18a.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_a478f0d589ed42e180778d558f1a46bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loneminovu/lisimix.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/mofikadipibilikuwunax.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_ece4f7884f644d1daad18a65a7c57113.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b58819-3598-489d-bd1d-7e5f7317d2af/ocd_cbt_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/door_hinge_template_jig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326c16dc-7b68-4d43-a330-d2b70207e713/rosemarys_baby_streaming_vostfr.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/website_templates_for_book_sales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f850ede4-0e63-43f0-8f50-d35cb308b37d/fallout_4_ps4_guide.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_off00010e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 5348 bytes
SHA-256: a34d8c08f8d300a9de23ca4426870251e98b2e9fc666d93156b459a3a6eb1d01
font_01_sfnt_off000120bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 11136 bytes
SHA-256: 1b4ea3974b47b8c0c7d475b5241b0ec2bc8337740365c3829cc79c6354513fc2