Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bfa3771613fb80…

MALICIOUS

PDF

69.3 KB Created: 2021-02-25 15:23:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9ae761f432992a5654d71aa98b9ddbb7 SHA-1: 3538947190fed849aa4b62afa5ac140d9a7b5fce SHA-256: c1bfa3771613fb80e4d1db381b4a8833dd71730062ba034f8c1b1d5245b05fce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/wix?keyword=bob+the+robber+2+unblocked+games+66 PDF link annotation
    • http://vinnipoh.space/3230825874455bi.pdfIn PDF document text
    • http://bufovapafiwew.22web.org/pomiramuvokoburivojir.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/lheGdgb/car_racing_2017_game_download.pdfIn PDF document text
    • http://tifizifojaf.iblogger.org/chalte_chalte_songs_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/hhjjnij/hollywood_story_fashion_star_hack.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/fafabupagubunegaritodo.pdfIn PDF document text
    • http://delinapod.mypressonline.com/how_to_solve_radioactive_decay_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/nukebomevobe/hpeKnic/28027765884.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/iiIidha/18848778376.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/eqjabum/azara_eau_claire.pdfIn PDF document text
    • http://polfact.site/digestive_system_diseases_listyjg2i.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/nhbP9Xt/lurafelokaselipigesijeje.pdfIn PDF document text
    • http://tersq.fun/baofeng_bf-_888s_programming_manualkcf0u.pdfIn PDF document text
    • http://metalllift.ru/amharic_holy_biblega485.pdfIn PDF document text
    • https://cdn.sqhk.co/kisereta/Yji7Ojb/zagov.pdfIn PDF document text
    • https://cdn.sqhk.co/xoberuweri/hfmOe8a/50p_coin_collection_display_case.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/linkers_and_loaders_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisazabe/82078405863.pdfIn PDF document text
    • http://javasuk.epizy.com/download_ps3_bios_zip_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/ardas_kran_movie_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/bsa_medical_form_high_adventure.pdfIn PDF document text
    • http://misinaguzorolul.epizy.com/free_survey_results_report_template.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/what_is_the_sum_of_exterior_angles_of_a_regular_polygon_of_nine_sides.pdfIn PDF document text
    • http://volapubexu.epizy.com/66861117733.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_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 5892 bytes
SHA-256: b150c5cd3891c6d7a1903246a4f8500dc32761325de8566454ce92f668eec093
font_01_sfnt_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 9568 bytes
SHA-256: 49634d563144484ebfd168e6bed022a2eee722c6306d6fae6e89bce23dc729f4

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