Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df1fa4983504553…

MALICIOUS

PDF

77.1 KB Created: 2021-04-01 16:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2dc4df24476a8bcb251699df2633e728 SHA-1: 5b5d059d46ecf4ee83a0dc9479e9272731643c0f SHA-256: 0df1fa4983504553e1973707f10e29fc8d548edce92a8c134d0709ebefe67086
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=farm+and+agri+engineering+pdf PDF link annotation
    • http://nunovoxiwanafuz.getenjoyment.net/cerita_horor_kaskus.pdfIn PDF document text
    • https://cdn.sqhk.co/sixojifez/XoSvI9g/empty_ice_cream_cone_coloring_page.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/jehcheE/fudumufitozavu.pdfIn PDF document text
    • https://cdn.sqhk.co/fixuzigetir/tjhggha/bob_marley_albums_free_zip.pdfIn PDF document text
    • http://rexuxudal.22web.org/manualidades_para_nios_sobre_dia_de_muertos.pdfIn PDF document text
    • http://pukebebizadolu.mypressonline.com/interview_tips_download.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/blackjack_basic_strategy.pdfIn PDF document text
    • http://desofudexe.22web.org/oxford_math_book_for_class_4.pdfIn PDF document text
    • https://cdn.sqhk.co/mopijiluxu/mhguij5/gazoju.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/jgihggh/pyramid_of_giza_mystery_solved.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/a_practical_english_grammar_structure_drills_1.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/7cfdc61b-9fef-4438-825c-b0e9bc66d7c8/how_to_connect_furby_via_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c53ebd-3a27-4581-985d-85e153c0fc93/kajunewokorugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d293ece-e0f8-49f8-b6d0-588261a5f617/dessler_g_human_resource_management.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_25b29be3ee414942b2f63c332e438a19.pdf?index=trueIn PDF document text
    • http://nigukeja.epizy.com/61333240864.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_68163284da9e4f9d8374604ade7edd76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bda341-cd01-483c-b05b-d5b4c130a601/become_what_you_are_alan_watts_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d186df2-28f4-447b-9b5d-c5f7c5b1336e/30289654053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b53f28-d97c-4fef-acf1-868b3c397ad0/vitizoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106ff2c5-a8a3-41fe-ae1f-c5e7c422d2d5/my_sharp_lcd_tv_wont_turn_on.pdfIn PDF document text
    • https://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_79882f855f0744fbae22452f1a74e6c2.pdf?index=trueIn PDF document text
    • http://semowomeso.onlinewebshop.net/3352440386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5790b1ac-93aa-4d23-8d19-9384900ec0c9/deepak_chopra_21_days_of_abundance_day_21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa427e01-292e-428d-a141-98b5cf29f992/zoom_g5_manual_portugues.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_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 5104 bytes
SHA-256: 8c0cb4f9eebc69f3c3258de60a9cd09dea39c9baaec68db10cf900450078efc6
font_01_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 10936 bytes
SHA-256: c4aa4bad28ade6c6bccb08f5b76d147542fffac454819e36f865e8ef1951f2ad