Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9640af8e7e9a6b…

MALICIOUS

PDF

77.8 KB Created: 2021-03-21 01:33:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b32ef056f4048f4e38d0af2a1d559c6 SHA-1: b39f01e1d79af3b70704ed67a877aa201681c5c1 SHA-256: 5a9640af8e7e9a6ba2cd85e37b7dc8d1fe0f331e1857bbc9a71626dd5cd33532
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to 'ponafet.ru', suggesting a phishing or malicious redirection scheme. The presence of PDF_SEO_LINK_FARM heuristic further supports the attack pattern of using link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=atziri+run+guide
    • https://cdn.sqhk.co/rexukewanej/ihhfjKe/piano_magic_tiles_pop_music_2_apk_mod.pdf
    • https://cdn.sqhk.co/madagijoj/Hhhie6E/ravensburger_disney_family_puzzle_500_pieces.pdf
    • https://cdn.sqhk.co/fugutexifi/ihjdFwN/plants_vs_zombies_minecraft_mod_1._14._4.pdf
    • https://cdn.sqhk.co/putuziboki/ichfjjy/sozelasebawupidop.pdf
    • https://cdn.sqhk.co/fuxiwimemo/ageihhc/deals_direct_247_facebook.pdf
    • https://cdn.sqhk.co/wefekoferu/jbi2Mgf/yellowstone_season_1_episode_2_soundtrack.pdf
    • https://cdn.sqhk.co/jarixizotib/d0P9hyH/ninja_assassin_warrior_legendary_super_hero_survival.pdf
    • https://cdn.sqhk.co/gabebutiz/YtqheOi/2712597708.pdf
    • https://cdn.sqhk.co/wisewuguv/ahhjjic/abc_song_nursery_rhymes_free_download_mp3.pdf
    • https://cdn.sqhk.co/zirigajer/xqIAje4/travel_pang_arcade_game_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tixedujegibex/multiplying_mixed_fractions_worksheets_5th_grade.pdf
    • https://s3.amazonaws.com/bipepezuwed/pizuvepatedabop.pdf
    • https://uploads.strikinglycdn.com/files/f3f9e499-be69-47b0-838d-7d214eaa3380/27349655932.pdf
    • https://0f939073-77d1-4307-aaa8-42539c8515e3.filesusr.com/ugd/85c9df_685a06d587954a0a86aa3db79f10b15a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d5ca46c3-49c1-4ee1-ab98-7ce7755842a3/where_to_find_shovel_links_awakening.pdf
    • https://s3.amazonaws.com/jinabom/online_dating_site_reviews_consumer_reports.pdf
    • https://s3.amazonaws.com/wibedubosateg/ralanekaxabatudowipefe.pdf
    • https://uploads.strikinglycdn.com/files/34da7964-bf7f-4b8a-ae99-e9860d7fe185/88823437914.pdf
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_ad90544f2e334d188cd5a980c38fd213.pdf?index=true
    • https://s3.amazonaws.com/tubupejevomo/wofugopi.pdf
    • https://s3.amazonaws.com/tunenijexe/learn_portuguese_now.pdf
    • https://s3.amazonaws.com/gapivegek/91007894057.pdf
    • https://s3.amazonaws.com/tikoweravisixu/75313618874.pdf
    • https://s3.amazonaws.com/dikobepibelun/gufifepabijudolovegi.pdf
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_04b4dda8f29a465cb9cca83b6ae55276.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f6.bin
ad8c70d6cdd50459a67b17d817e64cc81d93ceee69565e9393edc84977c7ad0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 4612 bytes
font_01_sfnt_off000105c1.bin
f54478cbd9f37c2e44ee43b48c5aa86764ec2b2981d577a3f349d7f4690767b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 10532 bytes

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