Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b853180a284381…

MALICIOUS

PDF

75.6 KB Created: 2021-04-17 16:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1bb158fcb109c430be1434728ae9f54e SHA-1: 2bb13676428be8f870dfe73c2cab8874c8da18a0 SHA-256: e4b853180a2843819239dc9b842a73294841020773f767ac86553ef05e070030
126 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'soxebez.ru'. The document body, though heavily obfuscated, suggests a lure related to 'Starship troopers rpg character sheet', indicating a phishing or malware distribution attempt. No scripts were extracted, but the presence of multiple external URIs and the overall detection suggest the PDF is designed to redirect users to malicious content.

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 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://soxebez.ru/strik?utm_term=starship+troopers+rpg+character+sheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368500/normal_5ffd5d21cb5c0.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/ijahhfl/jalumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454435/normal_605bfffc32c7f.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/jida8ly/final_fantasy_tactics_advance_job_level_up_stats.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/jfFhi4a/the_wolfman_full_movie_1941.pdfIn PDF document text
    • http://xemivegofageg.22web.org/mubosebojowarorerol.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/ohggfsS/firestorm_air_hockey_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424933/normal_5fd15f299c307.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/hXCidhj/multi_word_anagram_finder.pdfIn PDF document text
    • http://sinagibopugapaz.iblogger.org/45773626741.pdfIn PDF document text
    • https://cdn.sqhk.co/loxusovi/iexxce4/72170537404.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447447/normal_600149ec32324.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/XAjiBje/juputazem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zugotival.epizy.com/bixepadunal.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/free_android_mobile_games_online_play.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1cd448-0388-4a86-8c41-136bb0780d20/washington_football_team_record_this_season.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e59b12-334f-4e8a-8582-2d2222b02a73/91952208996.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/3807167662.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/cease_and_desist_template_trademark.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca2f4f6-730c-488f-899d-c4277680fdfc/mokotomodopafusojetimafep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaaabbda-4427-4baf-87d3-bf6b599e008c/alphabet_phonics_sounds_chart_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/batevoberanobuk.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_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 5264 bytes
SHA-256: cc774756b0a9a614047d7b84546dd48b54d366fd5f96cd12676f2cdfbb962c09
font_01_sfnt_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 10824 bytes
SHA-256: a3bff947cca9f803f86540ec30a3eca195af98e36871dc87d89bcc3f208354e7