Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f50dc856ce25324…

MALICIOUS

PDF

105.1 KB Created: 2021-03-17 01:36:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 022dadc639735e707aac06f8c993880b SHA-1: 8981655c2e6910ad727ffb6967a6ff1ee18ef4a8 SHA-256: 8f50dc856ce25324a4f3a9cd503b0fcfbf6aba23af9b5ba0ad82936f3237826b
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ML classifier strongly indicated maliciousness, and the presence of external URIs further supports this assessment. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 4

  • 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://druttle.ru/award?keyword=normal+cdf+versus+pdf PDF link annotation
    • http://fuvidevifa.scienceontheweb.net/how_to_cook_beef_roast_in_power_cooker_nz.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/7ZcvDd9/51987966365.pdfIn PDF document text
    • http://fopekoriw.sportsontheweb.net/98949402904.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/hjtvjSl/super_smash_clash_brothers.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/E1jiXgj/mbta_commuter_rail_fitchburg_line_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/jozopotuwomo/jdOjjid/toca_mystery_house_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/XjeuaWl/bbc_royal_family_documentary_1966.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/jdiayth/xomukupemabonunimufug.pdfIn PDF document text
    • https://cdn.sqhk.co/xozirijor/gcigHhi/download_forward_assault_mod_apk_latest_version.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/pogatuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ranitirunom.myartsonline.com/64284773868.pdfIn PDF document text
    • http://fojodopid.rf.gd/kaxonepugovitamuwakifaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/61015801370.pdfIn PDF document text
    • http://rofexivagonipuz.rf.gd/traditional_vs_modern_methods_of_teaching_mathematics.pdfIn PDF document text
    • http://pamapubosozule.epizy.com/agenda_21_global_resumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/596d41b1-9f12-4767-91b4-91d619a97b40/nukoxefazive.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/everglow_coldplay_piano_sheet_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a84d36bb-5832-42c1-b1b4-9a683dcdc30e/18328771943.pdfIn PDF document text
    • http://bexisojulodu.epizy.com/29197429149.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/vubixejulefidanibuwalixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b743a205-e1d0-40b0-9424-36111a8e2c1f/raindrop_prelude_chopin_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/a_tamil_movie_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3ffb2c-d6fd-4096-a959-25170030aad0/7420541620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2969b8-52ed-48fd-9719-c5c89c8c7c64/pioneer_elite_sc_95_firmware_update.pdfIn PDF document text
    • http://tosipasakuvil.myartsonline.com/circle_of_life_2_part_choir.pdfIn PDF document text
    • http://bekokutiwafodi.epizy.com/zemotogorifuj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC0 5332 bytes
SHA-256: bdbe5ce31fb7f1ce685ef887afc3826f77da90e9e611d3f696066b9305fcfd6f
font_01_sfnt_off000150d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D4 13980 bytes
SHA-256: 1dad272ece34c76b482b77953ab1b8f4f89fc205a918630b86f5fbb33c15f8ec
font_02_sfnt_off0001806d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1806D 16384 bytes
SHA-256: 06643c88a3dd3328677d8f8af4653b2aee33a82b28edfdf2b715fcd563574c94