Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cfaf453ba775d6…

MALICIOUS

PDF

77.2 KB Created: 2021-03-14 14:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6201004901b5356d71ad201cf419946d SHA-1: 60d30b1e721d74effe6ae1d60d3412fa11e09950 SHA-256: 11cfaf453ba775d66b24c86f7898d73725759d530f8ddb8c6770523971ac503c
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://kuzutuzo.ru/strik?utm_term=is+fl+studio+compatible+with+mac PDF link annotation
    • http://nosilekexiwot.mywebcommunity.org/97180309640.pdfIn PDF document text
    • https://sowovejapa.weebly.com/uploads/1/3/4/7/134709895/dejelu.pdfIn PDF document text
    • http://mefuxorimuba.22web.org/voice_operated_induction_motor_speed_control_through_rf_communication.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/0bf78133b.pdfIn PDF document text
    • https://zukepuroxile.weebly.com/uploads/1/3/4/7/134746995/devokito-mapanug-gewivolad-xajukira.pdfIn PDF document text
    • http://dasonudulikuvon.22web.org/agneepath_1990_background_music.pdfIn PDF document text
    • https://pavadugubuwab.weebly.com/uploads/1/3/4/3/134309483/megulufusi_vepase_zomavejagupu.pdfIn PDF document text
    • https://pudisemibupar.weebly.com/uploads/1/3/4/0/134096773/xuritirifas.pdfIn PDF document text
    • http://worldworkbook.com/how_long_does_it_take_to_get_a_diabetic_cat_regulatedcjhwb.pdfIn PDF document text
    • http://kyponnik.online/does_apple_tv_have_english_premier_league2a7j0.pdfIn PDF document text
    • http://omshop.space/548078167503p0qf.pdfIn PDF document text
    • http://fapenas.22web.org/tamil_full_movies_app.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/83700290254.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fosoxubap.epizy.com/tomojozisurepajuterijiso.pdfIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_7f4e7ce3e8df4b88a99b617dbeae93e6.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_922fbce1e0014d589f6d68edd69b6415.pdf?index=trueIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_eda08b5ed1c24e50ab0319f8d5f7e917.pdf?index=trueIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_39d7153d0dac4ef2ab534a283fee5b74.pdf?index=trueIn PDF document text
    • http://tivexedasabuxi.myartsonline.com/pabuwamewoka.pdfIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_4b40c860fbfe498d9b94d1f987b35bce.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 5468 bytes
SHA-256: dab6901681b69e08d348e0705051fe6dd8025233409d39cbe54fbd3293550c71
font_01_sfnt_off0001015d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 11104 bytes
SHA-256: b7535d532d1de98c4c27b1515464c062e999f4f3620734a67c98124c2d05fd35