Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8532b36cb468b0…

MALICIOUS

PDF

77.3 KB Created: 2021-03-21 01:17:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2374336ebd72f4579c218e3c66bcac1b SHA-1: ec95087ebf7dcbbef5b3ee00776578897d47100e SHA-256: 4e8532b36cb468b09e5af2946019ec84bd576fd4795fddfbd3909254e6fb6ed9
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'preinscripciones 2020 primaria' and metadata indicating it was generated by wkhtmltopdf, suggesting a phishing or scam lure. The embedded URLs point to various disposable hosting services, further indicating malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crophysi.ru/wix?keyword=preinscripciones+2020+primaria In PDF document text
    • http://ligorowimilupux.22web.org/jezebojaxuru.pdfIn PDF document text
    • https://mefuwowenapes.weebly.com/uploads/1/3/4/6/134611128/nefomojapijamajirov.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/nie_boska_komedia_sprawdzian.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/548p8mj/dj_sound_effects_zip_download.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/aluminium_sulphate_manufacturing_process.pdfIn PDF document text
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/8761730.pdfIn PDF document text
    • http://vijufik.iblogger.org/autocad_2d_chair_blocks_free.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/pijelosavo.pdfIn PDF document text
    • http://wodaretibinusad.22web.org/bounty_hunter_2016_korean_movie.pdfIn PDF document text
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/rexagu-zemutasogav-vafexe-loledikirabepav.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/prfjdjh/rumble_in_the_bronx_trailer_deutsch.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/how_do_you_convert_julian_dates_in_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/jjTNRII/pixel_art_iphone_7_wallpaper.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/roland_td_30_hi_hat_problem.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/df1e6711-1183-4397-9772-259ebee7203d/xivuwulikekabalamidirit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ceb8ef-e218-4bff-b874-4b7a09fbe805/what_are_some_examples_of_skills_to_put_on_a_resume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a3df9b-275a-4cb3-b6cd-e60f279bf55e/how_much_do_electrical_engineers_get_paid_in_south_africa.pdfIn PDF document text
    • http://zisepuz.rf.gd/is_bram_stokers_dracula_book_scary.pdfIn PDF document text
    • http://jezodefobagepa.rf.gd/gastrointestinal_conditions.pdfIn PDF document text
    • http://mapegolirij.epizy.com/6294842692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ba9db5-dde2-4129-b1ec-ebe65cc56f58/behringer_u-phoria_um2_specs.pdfIn PDF document text
    • http://sovezogodum.rf.gd/deferred_revenue_in_balance_sheet.pdfIn PDF document text
    • http://lexezov.rf.gd/57746084746.pdfIn PDF document text
    • http://jomopizemiz.onlinewebshop.net/68603352405.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_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 5324 bytes
SHA-256: 382ba348e5107ffd322aa25bd6bad141d8d0f156252601b86bc3074e9fa68edc
font_01_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 12256 bytes
SHA-256: 02e411a157f46bb3d059135fd50bc2b276a8762e491861381328b1af8860ca14