Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7c8eafdc804b79…

MALICIOUS

PDF

79.5 KB Created: 2021-04-01 14:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1e03dc4a7002b6d8ccdea868ec8b14d6 SHA-1: 2d4b2b6377bbc268cca36d73d8e8610b58b4a6b4 SHA-256: 7b7c8eafdc804b79b09962d81f0bea5de285b6b82cac306a45c327e81c16f95e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a high volume of outbound links, with one prominent URL being https://soxebez.ru/123?utm_term=new+product+launch+powerpoint+template. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

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://soxebez.ru/123?utm_term=new+product+launch+powerpoint+template PDF link annotation
    • https://pajobozonojamu.weebly.com/uploads/1/3/3/9/133997184/nekap-fewoxewaj-xokafeze-wanumabukuzi.pdfIn PDF document text
    • https://vanevuzitikuge.weebly.com/uploads/1/3/4/5/134588875/mowozutafo-xapojezememopag.pdfIn PDF document text
    • http://mugukix.mygamesonline.org/cuales_son_las_preposiciones_en_espaol.pdfIn PDF document text
    • https://pasuwuzo.weebly.com/uploads/1/3/1/4/131438486/sonikijol-siwadigipaz-lazezok.pdfIn PDF document text
    • https://wivozodibadire.weebly.com/uploads/1/3/0/7/130775536/zibibinugido_losiki_zakopowit_rebeto.pdfIn PDF document text
    • https://ledosixekesi.weebly.com/uploads/1/3/4/3/134313849/22b312acc2eee.pdfIn PDF document text
    • https://tubefirijivu.weebly.com/uploads/1/3/4/3/134351006/fareliwolarate.pdfIn PDF document text
    • http://rasipafus.getenjoyment.net/bejameko.pdfIn PDF document text
    • https://zelerajolames.weebly.com/uploads/1/3/0/7/130776056/maxezinasutov.pdfIn PDF document text
    • https://topasotasakaro.weebly.com/uploads/1/3/0/8/130874498/welifamuxizijek.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/5602460c-6d48-4487-a1f4-5a4ca544b3e2/download_twilight_full_movie_in_hindi_480p.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/bodas_de_sangre_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd9f12b-7be8-427e-8f3c-238f2ad368f6/my_polaris_pool_cleaner_tail_not_moving.pdfIn PDF document text
    • http://zivonupawidam.atwebpages.com/71762520648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d399955e-aa96-4206-8c58-0e41a363edee/49346036700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef5d9eb7-0909-4b94-bba2-36aa46889e53/how_to_solve_rubiks_cube_easy_in_bangla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc76d57-292f-4d9c-9bfb-7ed1d5a20f06/how_do_i_change_the_oil_in_my_craftsman_riding_lawn_mower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1129f5a-5517-4a34-8fda-3f93323c1849/16264224064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49350b37-7787-4f72-bedf-8d216c9c9cb5/solid_principles_software_architecture_design_better.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146d9779-bae3-49ea-808c-62842aa6d881/lagotonevezome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948dab9b-e304-45f7-a3a7-b99e986f3507/4_pics_1_word_level_238_answer_6_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5efe2737-faf1-41ad-921c-754954f926a2/how_to_use_hvlp_gravity_feed_spray_gun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/576bfe1b-ec89-4063-91d6-e96758272651/24298073697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee237d37-4538-4b25-a597-e94e4ce97968/66728386155.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_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 5196 bytes
SHA-256: 4ff0af51d994b1072afb751178640ee3fa87d52c8127f8ca9a9de0290a9d35ba
font_01_sfnt_off00010c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C18 10696 bytes
SHA-256: 923effb5d9114f6ac74c29b4adf1ba6eea03bf1ddbd7d5e7f3d12cd5f0b1025f