Malicious PDF — malware analysis report

Static analysis result for SHA-256 76efed9613ce5b76…

MALICIOUS

PDF

78.2 KB Created: 2021-04-07 20:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cfff0a8dfa979659bc7bf20b12b81cae SHA-1: e79578f97d288a22d98f1ff5ed4af2919619b076 SHA-256: 76efed9613ce5b76e96da17fc1f6eac0fca640d3d437d5f7e00e0b1ec50afb96
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to a movie title, which is a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=stephen+king%2527s+it+full+movie+in+hindi+dubbed In PDF document text
    • http://fujigukatujewu.medianewsonline.com/11772563948.pdfIn PDF document text
    • http://lastmarkt.ru/kavedoguzoluoodba.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/how_many_questions_are_on_the_cdl_combination_test.pdfIn PDF document text
    • http://gipogup.sportsontheweb.net/xoxokizezikawetumabavabux.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/6OifChb/67872871349.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/agarwood_plantation_method.pdfIn PDF document text
    • http://eferevole.com/99_chevy_blazer_wiring_schematic50p6m.pdfIn PDF document text
    • http://casser.xyz/tekin_rx8_gen_2_troubleshootinga5k7j.pdfIn PDF document text
    • http://gromstroy.com/6227082735usp57.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/maze_runner_cast_best_moments.pdfIn PDF document text
    • http://nawavidosuk.medianewsonline.com/analysis_of_quicksort_algorithm.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/life_fitness_elliptical_parts_x3.pdfIn PDF document text
    • https://cdn.sqhk.co/matozage/D0jjieH/enhancement_shaman_2._4_3_gear_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/didtgjm/85521799683.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_721cdc5af746483b9e9bd9bfbab0176a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7f86b0-d051-4663-b92f-cf3921d68852/sex_education_imdb_season_2_cast.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_5df1b97d4f2643c1aee4fac44581391b.pdf?index=trueIn PDF document text
    • http://xonolori.atwebpages.com/calculus_10e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e08c26d-d5f6-47df-8666-865f104e9567/ethics_and_the_limits_of_philosophy_review.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/animal_cell_structure_and_function_download.pdfIn PDF document text
    • http://gototura.myartsonline.com/what_do_you_wear_to_work_at_home_depot.pdfIn PDF document text
    • https://ea29520f-fefa-4c12-ab21-0e0839e82572.filesusr.com/ugd/5d2047_e55b606b674c46349e481f85ec259030.pdf?index=trueIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_c6be815cc583480fa5e1d2248caf2074.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b28f74-3da6-490e-ac79-5dc6960ee8ee/how_to_become_a_horse_dentist_in_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e61fa12a-c465-4a4d-bc64-39956c706f5f/reruk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85e1b0c-9fa5-4f3d-93f7-a9543080797c/65464980060.pdfIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_3725d236f3904524bd2ce77e1e4c4212.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_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 5552 bytes
SHA-256: 208f461c9b25a271945ead1e72ae3f0c9b2a1f9183bcdb687bfec9347dd7a84c
font_01_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 11072 bytes
SHA-256: 536662a1343565fdd0de984548fabacd854202df9e285aef3347efcb34fb8f4a