Malicious PDF — malware analysis report

Static analysis result for SHA-256 b393e90fdbe38cc0…

MALICIOUS

PDF

75.5 KB Created: 2021-03-10 01:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 873319adb978e489f131cb6200df3d95 SHA-1: 758014b36a13d89e9e1f628450f8ba154afbb1e0 SHA-256: b393e90fdbe38cc0af6e30d63d598b0cca5ea486a8bd66a7e608528244d0b260
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 0.9991

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://bologen.ru/strik?utm_term=model+3+and+model+s+side+by+side PDF link annotation
    • https://cdn.sqhk.co/maweveju/jjc9icZ/transaction_cash_app_money_sent_screenshot.pdfIn PDF document text
    • https://firiwipavixura.weebly.com/uploads/1/3/1/4/131407767/buwipo.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/hjqrT9y/dopedebo.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/a6gfVjj/duwelalabuvipapu.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/qcngiia/80643228317.pdfIn PDF document text
    • https://migufakugiguxob.weebly.com/uploads/1/3/4/5/134579218/jojamejegen.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/Bjfiigh/jixonobud.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/hqRjcja/drift_zone_ps4_tuning.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/jguCijr/74560674541.pdfIn PDF document text
    • https://tinonerapize.weebly.com/uploads/1/3/5/3/135349756/2755356.pdfIn PDF document text
    • http://pokinusuvato.getenjoyment.net/planos_arquitectonicos_de_casas_de_2_pisos_con_medidas.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/jyHhiBr/galaxy_shooter_galaxy_attack_adventure_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dagorabowixu/Uibhchj/93509516940.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/ifigOgc/fried_bream_fish_recipes.pdfIn PDF document text
    • https://mogavibebeza.weebly.com/uploads/1/3/5/3/135318512/piguzinota_nivikonirevojok_bupivokezi_furilut.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/z4SgfCR/20137718662.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/phdDoje/ufc_252_results_sherdog.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/KH1PjaE/i_wish_stevie_wonder_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liduvitulugug.onlinewebshop.net/baixar_as_cavernas_de_ao.pdfIn PDF document text
    • http://zenowalu.rf.gd/fevazimuzavufidolinuki.pdfIn PDF document text
    • http://zunebodiz.epizy.com/zudos.pdfIn PDF document text
    • http://jelazib.epizy.com/no_fear_shakespeare_king_lear_act_2_scene_3.pdfIn PDF document text
    • http://degevojorak.myartsonline.com/70991974424.pdfIn PDF document text
    • http://terenido.epizy.com/34462113612.pdfIn PDF document text
    • http://jejotatimub.rf.gd/wuromozidikagoveresoti.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_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 5288 bytes
SHA-256: 91e6aabb9149eac0fa1bd1bc88a01d7bacde8c7792d66f74332e4371ff96a381
font_01_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 10476 bytes
SHA-256: ea36a29beba0a90674dc12dc25fa7b373531179c77acf9ed970fa9d0b7c8da32