Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c79e265dea755fd…

MALICIOUS

PDF

83.3 KB Created: 2021-05-26 21:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c31636a249135a41f20e01d5d21e2227 SHA-1: fc6d81e68bf25710ce45c24fbd28a9295b49fb20 SHA-256: 4c79e265dea755fdc45c758a0570ac57aef03b9480a63444df8468c7dadeccb3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'bologen.ru', suggesting a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, further supporting this. ClamAV detection and ML classification confirm the malicious nature of the file, likely used as a lure to download further payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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=basic+english+grammar+exercises+worksheets+for+class+7+cbse PDF link annotation
    • https://vurineju.weebly.com/uploads/1/3/2/7/132741272/lidilezogujefo_tijuxojirakim.pdfIn PDF document text
    • https://sanakifagijegu.weebly.com/uploads/1/3/4/4/134404207/jurolipojixo.pdfIn PDF document text
    • https://tonikajolokoge.weebly.com/uploads/1/3/0/8/130874266/c739d.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/846c4da1-8578-4018-8710-bbd5e6f79470/jalivibakij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d61c4e8-baab-475e-a1dd-8ef9a66ea8ef/barotupizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e703290f-01b8-4788-bfc5-19ea845d65d2/how_to_find_the_mean_from_a_cumulative_frequency_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb7f4c06-a610-4651-8e1d-ba68acaa4939/how_to_use_conair_steam_dry_iron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0df1a68-bcb0-4f7d-b979-80d74ef5709f/plot_graph_mathematica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb0a02f-fd9b-4b52-bdc2-e2b9b0ee6dff/grade_12_short_stories_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5954046b-7baf-4714-af58-b66ec131ae01/how_to_get_unlimited_money_in_gta_5_cheat_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8bb3e80-eb0e-4d91-8eb2-bffe941f978a/36130291771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d964e1c-2dfc-4950-85a1-7f3386eebec6/how_to_translate_documents_to_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d16ab2-e0e5-41f3-ab40-e29f3a04e7cb/ejercicios_de_sales_oxisales_neutras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4001f1c9-8c4c-4da1-9121-1c0654ec047f/duzutabitekekapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d9a2cd-9751-4fe0-92af-a6d530c21b3f/spider_man_ps4_vintage_comic_book_suit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cbe640-aa3a-410d-a6bb-7587fd181bc9/63480839588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a2b5e9-1c81-400c-8964-2645848fcb31/60171636200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e5d27b-4c89-4cc5-abe2-27c3fcd10dbf/deni_5000_ice_cream_maker_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ff520f-415a-4c28-9559-5df0fb1dd357/imdb_tales_from_the_loop_episode_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7be5bc-f277-477f-8933-9fb0f72d128a/sezojigaremeregitawojavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9faeef03-f2e9-4fe2-a3e8-e6e51e40409a/lesson_6_skills_practice_multiply_fractions_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a8ec3f-cc4c-4934-b1b2-944fe4259ed0/77215532472.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_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 5788 bytes
SHA-256: 517621e05e36718456eae31c4fc0497bebca3c39041da489957c90a103b83067
font_01_sfnt_off000117c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C1 11596 bytes
SHA-256: 9463a061c8fb4a599407d1339d53f5e97267b88da2a587722b6ddc5e4b170993