Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbda92582df6bc5…

MALICIOUS

PDF

76.3 KB Created: 2021-04-01 23:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 876b224f7a559321ad4405f3d20f15f4 SHA-1: 6d74506f9ececd38a4bfb39d413b1cfa82a50266 SHA-256: bcbda92582df6bc5ebfb3470074aae5fbd625a136f7daead771b3bf5ad6866d2
124 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to host malicious content. The ClamAV detection and ML classifier indicate malicious intent, specifically phishing. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7941

Heuristics 4

  • 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
  • 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=abbreviations+list+pdf+for+competitive+exams
    • http://lezobul.medianewsonline.com/66604145991.pdf
    • https://notususapi.weebly.com/uploads/1/3/4/0/134012365/pupus.pdf
    • http://dubunidenore.iblogger.org/zuxik.pdf
    • http://dupamineni.medianewsonline.com/jam_hang_up_speaker_how_to_turn_on.pdf
    • http://zomolejefej.mywebcommunity.org/wudivebadunemusive.pdf
    • https://lipixikipated.weebly.com/uploads/1/3/0/7/130776445/1a0a06c6e556d.pdf
    • https://fowitukusizuge.weebly.com/uploads/1/3/5/3/135325135/ravogija.pdf
    • http://liko-sneakers.com/cuales_son_las_6_p_de_marketingn78vn.pdf
    • http://relax35.ru/pukadofadelifijavew73yqf.pdf
    • http://marketitaly.info/pioneer_avh-4100nex_screen_replacement0zsvx.pdf
    • http://nusowutevu.getenjoyment.net/what_is_textured_ceiling_called.pdf
    • http://stroymarketmetal.ru/investigacion_cuantitativa_en_psicologia65dsx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nowoduxer.rf.gd/burris_eliminator_111_manual.pdf
    • https://c751e6e8-0850-424d-b14e-d7ae46260796.filesusr.com/ugd/bc1028_97aaeeb2cf204822b872c1df293cd78d.pdf?index=true
    • http://xekubizifakum.epizy.com/counter_type_analog_to_digital_converter.pdf
    • https://s3.amazonaws.com/xomudufe/74217625007.pdf
    • http://gidovofivoj.epizy.com/shake_hands_with_the_devil_book_free.pdf
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_cbb0d8b5d2414374b0b3537431b5a19d.pdf?index=true
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_76c27cfe733346be9a1b34abc1ebf4d5.pdf?index=true
    • https://s3.amazonaws.com/sulasatevirexo/how_do_i_reset_my_mini_smart_socket.pdf
    • https://s3.amazonaws.com/jepavilutabilel/frog_dissection_lab_report_33a_answers.pdf
    • http://lanosebezazov.onlinewebshop.net/56847501420.pdf
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_d732bc80c48b4589b487c565eb9e49ee.pdf?index=true
    • https://s3.amazonaws.com/dazuxujepov/ainsi_parlait_zarathoustra_friedrich_nietzsche.pdf
    • https://s3.amazonaws.com/poguvelefa/75077071809.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001056a.bin
e465d8206c006639d84a0ef5f0b34ae47d436b919669bc26b72b14d7a044e7ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 5348 bytes

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