Malicious PDF — malware analysis report

Static analysis result for SHA-256 9706b793b43ed119…

MALICIOUS

PDF

85.9 KB Created: 2021-05-11 22:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c44528e19ece4955ee20515b95c75bab SHA-1: 518f74e5b07b5d257efe55683d31168cd4487466 SHA-256: 9706b793b43ed11966af3175172297d2876746625d93fa12d46740393830931d
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 0.9998

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://pelibifir.ru/strik?utm_term=stihl+ts420+instructions PDF link annotation
    • https://xogiwudib.weebly.com/uploads/1/3/4/7/134715522/xifakugagedele_maginipu.pdfIn PDF document text
    • https://ganepivojo.weebly.com/uploads/1/3/4/7/134774155/d6822167653411b.pdfIn PDF document text
    • https://cdn.sqhk.co/julukimesof/geifhd4/smart_manager_gigabyte.pdfIn PDF document text
    • http://geleostone.online/240789718692n458.pdfIn PDF document text
    • http://idslim-italia.site/whats_the_best_eyelash_extension_kitug4ab.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/xjbghgh/national_capital_funding_group_llc.pdfIn PDF document text
    • http://unlockdeals.shop/interior_design_games_online_freeu1118.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/zojofebi.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://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_4389127703eb41febae1969be8392174.pdf?index=trueIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_1561721c7cd54859bb218eedb06ebc73.pdf?index=trueIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_6063fe06bd86443e858c7a7f8242b017.pdf?index=trueIn PDF document text
    • http://xobibaga.myartsonline.com/statistical_data_analytics_piegorsch.pdfIn PDF document text
    • http://nudoritane.atwebpages.com/ipl_2020_schedule_download_cricbuzz.pdfIn PDF document text
    • http://zevusup.atwebpages.com/auntie_anne_s_catering.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/microsoft_outlook_ing_old_emails.pdfIn PDF document text
    • http://movasedumanepe.onlinewebshop.net/alimentacion_enteral_en_el_recien_nacido_prematuro.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/walmart_photo_promo_codes_october_2019.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_893cfb9430ef4d4983cf3f4a7aa1e75d.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 4908 bytes
SHA-256: 3ab78ace4b21f480de5a9162cb6f8185efc35e3c85ee08ca22d65b08031ef413
font_01_sfnt_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 10732 bytes
SHA-256: 94f5602beafef9dce9b3c8615e2277ae30de72089832562162c7ab2c62ac991b
font_02_sfnt_off00013acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2