Malicious PDF — malware analysis report

Static analysis result for SHA-256 27936f2f2c8d1e08…

MALICIOUS

PDF

126.3 KB Created: 2021-04-01 09:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5ae787e21c50e5742fd405bbea7bc408 SHA-1: 96639248616ed55c88f9bb6e1120bd7751d1deb5 SHA-256: 27936f2f2c8d1e08bbaa0684324cf092e9f31c5f72b4f35d1c6ef40f3a66ab80
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to distribute various types of content, including potentially malicious files disguised as PDFs. The document body, though heavily obfuscated, contains text related to downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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=all+in+one+social+science+class+10+pdf+free+download PDF link annotation
    • http://hookup153.online/brawl_stars_private_server_apk_download_2020n29pa.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/bhghbZS/current_airman_s_information_manual.pdfIn PDF document text
    • http://coupons2020.info/android_app_development_ideaspwy49.pdfIn PDF document text
    • http://otomail.business/23692128364yskwc.pdfIn PDF document text
    • http://idclick.cash/how_to_change_battery_in_liftmaster_garage_door_opener_keypadhr5xz.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/sapewawonurejesutupd7dr.pdfIn PDF document text
    • http://springtea.space/229935594591k65m.pdfIn PDF document text
    • http://itravelimpressions.com/solar_system_for_kids-_colouring_pagespk2aq.pdfIn PDF document text
    • http://helpverifybadges.com/linear_functional_analysis_bryan_p._rynne9ih1l.pdfIn PDF document text
    • http://bubble1.space/why_is_effective_communication_in_health_and_social_care_importantvoqdg.pdfIn PDF document text
    • http://moreprodukti.com/cannot_detect_flash_drive_windows_10bzy6s.pdfIn PDF document text
    • http://ital-girl.space/29723375890g2o8s.pdfIn PDF document text
    • http://lami-lashes.site/beseneninegdo.pdfIn PDF document text
    • http://olymp-trade.top/the_size_of_each_exterior_angle_of_a_regular_polygon_is808yt.pdfIn PDF document text
    • http://usacarins.com/xidebixokedapuwerafitixmx4yi.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/g7ALjiv/18080830241.pdfIn PDF document text
    • http://it50disconto.info/pogobonipiruvvko.pdfIn PDF document text
    • http://chunyoo.com/dosojuzikujilunadapakasi2bytj.pdfIn PDF document text
    • http://damita.fun/is_spice_and_wolf_light_novel_finishedibefu.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/6hegdii/ruvuxerarimufinefo.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/7296f964-c366-4fde-85e4-c488c32a4eb5/hampton_bay_windward_remote_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb1d2f7-2e15-449a-b7b1-cd15174f7d3f/tipos_de_esquemas_con_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c97147b8-8627-42d2-bfb8-89151fedc68d/cisco_networking_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5788798f-12c1-4618-8cf6-5835d8a28f0c/teatro_en_casa_5.1_canales_rca_rt2781be_200_watts.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_off0001b3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3DB 5424 bytes
SHA-256: c0384670841eadbcda2187353d6f4a01942387448942e32734d4a3ff88d8e3ec
font_01_sfnt_off0001c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C677 11008 bytes
SHA-256: 484056ce66a2f75a042bd31ee6bb8eb4687232dbbf457ac03de05f903566be84