Malicious PDF — malware analysis report

Static analysis result for SHA-256 4521d9f08f70473b…

MALICIOUS

PDF

75.8 KB Created: 2021-06-09 17:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 256731a9565399b7c769d78654a8fb63 SHA-1: c3beca4e38c0a206cc1e7d52df234f8f6c1e36d8 SHA-256: 4521d9f08f70473bb1f4b343034e973810c61c712f1a3774de55687f330af0d1
186 Risk Score

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 0.9956

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://cructi.ru/pbw?utm_term=william+moulton+marston+movie PDF link annotation
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/70f34da2a1fc4.pdfIn PDF document text
    • https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/vafonog.pdfIn PDF document text
    • https://detabifaf.weebly.com/uploads/1/3/1/4/131436978/pirolukavojakem.pdfIn PDF document text
    • https://bawilawuvibowe.weebly.com/uploads/1/3/4/4/134401702/88d8c7289.pdfIn PDF document text
    • https://sekirodalod.weebly.com/uploads/1/3/4/6/134673836/kavudivosud-tevijafixip-delasudibaxan.pdfIn PDF document text
    • https://fibusoza.weebly.com/uploads/1/3/0/7/130775704/nudeniwalofukelo.pdfIn PDF document text
    • https://famojiwogupoj.weebly.com/uploads/1/3/2/3/132303340/kexip.pdfIn PDF document text
    • https://foxuveguba.weebly.com/uploads/1/3/5/2/135297813/7484438.pdfIn PDF document text
    • https://xinemituvirow.weebly.com/uploads/1/3/4/1/134108685/6143835.pdfIn PDF document text
    • https://bixaguvukimub.weebly.com/uploads/1/3/1/8/131872105/wowonotufujigu.pdfIn PDF document text
    • https://mirebaxowani.weebly.com/uploads/1/3/4/0/134017623/31e346e239d660.pdfIn PDF document text
    • https://sawonelezaxiso.weebly.com/uploads/1/3/4/5/134588179/xujekoj_sakur.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/guvupokiwifuronap.pdfIn PDF document text
    • https://kugovowakewel.weebly.com/uploads/1/3/4/0/134040427/9047359.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/f659ed1b-7093-4e42-8fce-5ca7d79dad12/curry_blake_dht_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af8a92c-210d-44f7-9aea-a91a8a70bbcd/tai_chi_24_form_slow_motion_with_instructions.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/lovefilerokak.pdfIn PDF document text
    • http://zolunegoli.pbworks.com/f/strategic_management_southern_african_concepts_and_cases_4th_edition.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/w/file/fetch/144865113/how_can_you_tell_if_a_bond_is_polar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37bc3801-da37-463c-b3aa-95499aa78a76/93144120197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d52d946-b7e7-4eb9-93ee-048ef23eb562/tezasoxowu.pdfIn PDF document text
    • http://jazonewu.pbworks.com/f/sodapotapitukux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3189c00-65db-4535-b196-f86a640db730/xizaxeretefupovenamewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e80998e-4622-42b0-9b02-27e48577f487/80893043595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a818391-32c3-42f0-9afc-c7873702f609/kumewovinetuwedexi.pdfIn PDF document text
    • http://jebusolole.pbworks.com/f/suxepijububikofetafeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a16fd1d-10a2-426c-a10b-29ffb1baa758/how_to_prepare_cash_flow_statement_from_balance_sheet_and_income_statement_in_excel.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_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 4904 bytes
SHA-256: c1673c74f76c15e1507823eb64994e4dae91dd299a56c3d64921b6f71e9a5387
font_01_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 11552 bytes
SHA-256: 20afd936bc7fa5fdad8481301a9295c5e3c35b2855a9e16cefc579d462650375