Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfea8abb8a59216…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 07:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 171cb1a92123f7ca634f2aead71d0531 SHA-1: ac80a2148ac020aac895824765fc8ef6ba296218 SHA-256: fbfea8abb8a592161b2811c978bbb210a501f59222752dfeac81221189feaa85
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it's part of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation method and potential use in automated content creation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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=bases+fortes+e+fracos+pdf PDF link annotation
    • https://cdn.sqhk.co/ruperodu/higfhge/tukanavufogikitagopamamu.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/jhtXiih/90s_movie_quiz_questions.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/vista_128fbp_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/jfFjgnx/piano_tiles_4_magic_tiles_go_2020_descargar.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/55408586934.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/Dhijji4/west_cowboy_gunfighter_game_free_shooting_games_online.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/78ac8209-a97d-456f-ac9b-82b6eea0d056/dovaremuj.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_d593dc1f0fff436193a72c327b02499e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazutun/wunidatox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab1c066-cf3c-453a-83f9-7ec41c36a88b/teziwixox.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/settings_of_government_in_social_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d1e517-9641-45b1-8b2f-8ff553c22c0d/how_to_shut_off_sprinklers_for_winter.pdfIn PDF document text
    • https://6b2d4799-12fc-456d-8881-596234ac9a0a.filesusr.com/ugd/ae8ff6_bfbfef08a68c4b208eb9ba9a3de1f22a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/screen_grab_video_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/ministers_black_veil_setting.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/75731555201.pdfIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_4d4b85e318c54b539fea337def5fc81a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/netinuwa/85054410039.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_9062339e8e8943ed9386e33559ea49aa.pdf?index=trueIn PDF document text
    • http://mixezized.myartsonline.com/paradise_lost_book_1_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/dipuxixika.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_8ad275a81d1f42318c394658dcc83876.pdf?index=trueIn PDF document text
    • http://mixezized.myartsonline.com/anthropometric_data_sheet.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_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 5164 bytes
SHA-256: b024a567c39d221188ac90e234f2922347b57be49bbc4e0897ca3c68bc474f44
font_01_sfnt_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 13288 bytes
SHA-256: d90b7f345246a83c88bba53aa638a15b7498471d0b9212ffa7a2be202d1cf825

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