Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ef474f4f71323a…

MALICIOUS

PDF

103.0 KB Created: 2021-04-06 01:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c039be8d336d2430a114785236e9c861 SHA-1: 14b63e2c0e8a08cbf5ea5cbbebdfb4b444b8ee46 SHA-256: b3ef474f4f71323ae39e2fd57c6b02d3b6446cdbe7de05651795732d059506d8
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for phishing or SEO spam. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to drive traffic to various sites, including the primary malicious URL found: https://jacksth.ru/wix?keyword=kik+lag+code+generator. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://jacksth.ru/wix?keyword=kik+lag+code+generator
    • https://cdn.sqhk.co/radojiga/LJWgd0c/introduction_to_business_grade_10_textbook.pdf
    • http://zukixulen.mypressonline.com/paxukikevajeber.pdf
    • http://usesucre.pro/what_are_the_instrument_of_data_collection_in_researchdygrh.pdf
    • http://subbellassecret.com/just_2_words_answers_level_779gz215.pdf
    • http://shtangye.xyz/child_of_mine_carole_kingczx6i.pdf
    • https://cdn.sqhk.co/molodomo/mmhaicf/enemy_strike_download.pdf
    • https://cdn.sqhk.co/fudamozomeb/vLBoJgf/tojinolijumusobinoze.pdf
    • http://veselutut.mywebcommunity.org/59712815543.pdf
    • http://tilikef.mygamesonline.org/android_studio_tutorial_italiano.pdf
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdf
    • https://cdn.sqhk.co/rexukewanej/EQ1cUjd/crazy_zombie_apocalypse_3.pdf
    • http://malespw.xyz/harvest_market_champaign_bakerysahyd.pdf
    • http://bachanalytics.com/60350970709jfulm.pdf
    • http://mini-cam-v2.club/the_hunger_games_free_downloadlccjo.pdf
    • https://cdn.sqhk.co/sadebupunen/e0oBiaw/famous_blues_musicians_2020.pdf
    • http://dontbeshy.xyz/swepco_arkansas_power_outages2f3p9.pdf
    • http://accface.in/57001797596uchtw.pdf
    • https://cdn.sqhk.co/tukepola/icigRik/1516508988.pdf
    • http://belkwigs.com/honeywell_th8110u1003_resetgvkog.pdf
    • https://cdn.sqhk.co/gatuwaven/ijbMpgh/knight_of_cups_tarot.pdf
    • https://cdn.sqhk.co/burajugi/huihdLf/savuzuwafijivozipobiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6b2d4799-12fc-456d-8881-596234ac9a0a.filesusr.com/ugd/ae8ff6_3271480f70464e99a7cbaa6b6205e845.pdf?index=true
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_e893ef56a7c24e54a220b410421b6cad.pdf?index=true
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_647cf16a603a440286189d31dea861e8.pdf?index=true
    • http://kopolug.myartsonline.com/disiwaxezejaxofexanenezog.pdf
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_447beca65a1149359895befe565e874c.pdf?index=true
    • http://lurolubudoruk.onlinewebshop.net/canadian_ballast_water_control_and_management_regulations.pdf
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_6548da2d88514e6caf846bae85acbad4.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_off000148bd.bin
31f8f535c20118678fb3beead72984c49dbbfb6e4e528a5bed7d96cdb0c9e659		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148BD 4960 bytes
font_01_sfnt_off000159ac.bin
c57ade43bce57a04d4721e498e03627728a3a7704e26b066c8fda30a9f85587b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159AC 17148 bytes

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