Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a888458dca001c…

MALICIOUS

PDF

86.4 KB Created: 2021-03-14 16:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ec20b79c0a6ca22831042cb412ce92c SHA-1: e13a9fca1ba0c817027fa0e79cb7dbc849092028 SHA-256: 85a888458dca001c340979ea8e853d715e4d1c0dc868409f5259e9e72c8973e3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://druttle.ru/wix?keyword=gta+3+apk+mod+obb', indicates a potential lure for users searching for specific content. No scripts were extracted, but the presence of numerous external links points towards a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://druttle.ru/wix?keyword=gta+3+apk+mod+obb
    • https://cdn.sqhk.co/rujamuzizogo/4DMjjfs/maplestory_sheet_music.pdf
    • https://cdn.sqhk.co/jabosuve/igihjby/dream_daddy_joseph_date_2.pdf
    • https://xezatitewifesel.weebly.com/uploads/1/3/4/3/134393938/rusesob.pdf
    • https://cdn.sqhk.co/feletitami/rhaicUF/85590714013.pdf
    • https://tupusedaluniji.weebly.com/uploads/1/3/0/7/130738871/likinij-morutotisuta.pdf
    • https://cdn.sqhk.co/napumefu/uKXgeWk/girl_power_cheer_music.pdf
    • https://cdn.sqhk.co/fanoxozowupe/PlcjikS/best_buy_black_friday_2020_canada.pdf
    • https://wirorovikematu.weebly.com/uploads/1/3/1/0/131071137/vodasenibitolil.pdf
    • https://cdn.sqhk.co/nazabimon/mhdyyKS/survivors_the_quest.pdf
    • https://cdn.sqhk.co/molavagew/igerk4l/pimunijizezaze.pdf
    • http://sokixatov.mywebcommunity.org/administracion_de_recursos_humanos_idalberto_chiavenato_libro.pdf
    • https://cdn.sqhk.co/xutujipux/qbhbBhb/51148774025.pdf
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/9347536.pdf
    • http://lumobumekola.getenjoyment.net/76954896040.pdf
    • https://cdn.sqhk.co/wubunepan/gdCiecm/space_station_pinball_machine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kuwexugebukutim.rf.gd/tapezujuzukadagasa.pdf
    • https://uploads.strikinglycdn.com/files/833bc061-41e3-4235-b225-8b11045d710f/how_to_turn_on_mic_in_fortnite_ps4_without_headset.pdf
    • https://uploads.strikinglycdn.com/files/f56adeaa-5c24-4a95-947a-3607694b66fa/nunorozowazidok.pdf
    • http://givosike.rf.gd/47381577208.pdf
    • https://uploads.strikinglycdn.com/files/53a694ea-335c-4b33-8909-d0c9bb9d6554/organic_chemistry_reactions_practice_worksheet.pdf
    • http://zotebetusapi.rf.gd/charlie_choc_factory_characters.pdf
    • http://rukosivujuxu.atwebpages.com/splinter_cell_chaos_theory_coop_mission_3.pdf
    • http://gototura.myartsonline.com/haircut_locations_open_near_me.pdf
    • http://tiruweditivunaw.myartsonline.com/complete_bhagavad_gita_in_english.pdf
    • http://bufagefitazi.rf.gd/howl_and_other_poems_summary.pdf
    • http://naxezutozotos.rf.gd/new_bollywood_music_2019.pdf
    • https://uploads.strikinglycdn.com/files/09706c00-7c91-4d1c-9c76-5239a3c9a055/troy_bilt_2700_psi_pressure_washer_carburetor.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe51.bin
485c09daf90dcfb74999f6bb0b76987a2a3b2ba7d3cdc16d9437128b5b5f1985		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 5196 bytes
font_01_sfnt_off00010fed.bin
a30cb40fa02cf2a0ce4028f36abc23b35ff2f8a27dfb78ed15de8d799b85a339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FED 2628 bytes
font_02_sfnt_off00011b16.bin
9d061741221de5ab403d0fc2559e96eaee07e88d19d23f921ac4e32585a9a162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 20060 bytes

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