Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9599ad5de742c56…

MALICIOUS

PDF

77.2 KB Created: 2021-06-02 06:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 603ded7dcafacb3be52638d88ea954db SHA-1: 667da11326b798a71c55d8ebfbee5f25da2a6fc9 SHA-256: a9599ad5de742c5665ce8e6b4c049c54a26b18c7711409441a3e5053a1f5f07c
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings. The document body, though heavily obfuscated, appears to be a lure related to 'calluses on feet'. The presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent, likely to direct users to potentially harmful websites or to host malicious content. No scripts were extracted, but the PDF structure itself is used to host the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gurogujanesoxub.weebly.com/uploads/1/3/4/5/134506981/4580097.pdf
    • https://wimafepe.weebly.com/uploads/1/3/5/3/135326366/2189229.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Ecv9gJ3Ok6E/wb?keyword=what
    • http://nigezid.pbworks.com/f/rasijadodifam.pdf
    • https://uploads.strikinglycdn.com/files/abf671a5-0782-4029-acfb-e5358cf0a89f/will_there_be_a_new_harry_potter_game.pdf
    • https://uploads.strikinglycdn.com/files/3ed9cf7a-8baa-46ad-88d5-28f6d0280db3/vegetarian_ideas_for_dinner_party.pdf
    • http://kufogokoges.pbworks.com/w/file/fetch/144461973/ad_astra_movie_download_in_hindi_480p.pdf
    • https://uploads.strikinglycdn.com/files/5a15d39d-c5fd-4d95-895c-8ee402aac70c/how_to_fold_a_graco_pack_n_play_with_changing_table.pdf
    • https://uploads.strikinglycdn.com/files/6b5cdd0e-05b8-4b2e-bf3f-90e1dac0611c/kalyug_baitha_mar_kundali_ringtone.pdf
    • http://tazijebep.pbworks.com/f/sebeloseputiko.pdf
    • http://kinuwibe.pbworks.com/w/file/fetch/144443529/industrial_revolution_bbc_documentary_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/73e0b1a9-15f6-4815-82e3-6cc23f461057/puzosugopixakupigibutebir.pdf
    • https://uploads.strikinglycdn.com/files/4f736fb7-8bed-426c-bf7f-a0da766e26c0/bigizeriwonuzozatew.pdf
    • https://uploads.strikinglycdn.com/files/1f3708cc-a5e3-4aa2-b2c0-f8bbd597bb8a/local_multiplayer_survival_games_xbox_one.pdf
    • http://sizolasipape.pbworks.com/w/file/fetch/144415266/dilit.pdf
    • https://uploads.strikinglycdn.com/files/73ed2740-da78-4993-a2ae-2e4c7b2ff650/how_to_turn_on_a_tassimo_machine.pdf
    • https://uploads.strikinglycdn.com/files/d212a5ec-5f45-4056-8435-9ccad64b2765/brown_bear_brown_bear_activities_for_first_grade.pdf
    • https://uploads.strikinglycdn.com/files/6a0d7825-ee60-4e10-8ae7-df2b45b16980/can_samsung_a10_wireless_charging.pdf
    • https://uploads.strikinglycdn.com/files/76ad5279-9213-42d2-933d-289da198642b/how_much_is_a_battery_for_a_2010_toyota_corolla.pdf
    • https://uploads.strikinglycdn.com/files/4d158ecf-d132-410a-a33a-7fd179d8025c/hitchhikers_guide_to_the_galaxy_cast_marvin.pdf
    • https://uploads.strikinglycdn.com/files/6f3c1d94-6e22-4429-b733-be9d22e0beee/nodejexumevefolofep.pdf
    • https://uploads.strikinglycdn.com/files/804dec27-9f5a-4616-adcc-27c276fb05c8/balodorederuwaje.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ae.bin
5c26ddb1b020d83203725c8ce58741d070a823839e219b1dda5ebed9865b0350		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 5332 bytes
font_01_sfnt_off000102dc.bin
efe1205c87f339fae5e432583590828386c208baebceca0a798ac4841cda7d8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 10792 bytes

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