Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c7f6df19e53f03…

MALICIOUS

PDF

76.3 KB Created: 2021-03-23 09:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 59069c1822edab04ac62d3c4c2bfa242 SHA-1: 158fc6077c40080f02e30b3d0d6d68ee1591d4a8 SHA-256: b8c7f6df19e53f0371801caa13ed2b7f1d792a3c555c4dae29492e5ae2db25e2
156 Risk Score

Malware Insights

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

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 0.9997

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 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://gimoguvi.ru/123?utm_term=dr+steve+boorman+report PDF link annotation
    • https://gidunixodon.weebly.com/uploads/1/3/5/3/135322071/47da2338.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzesowasu/2ghe28e/apple_digital_marketing_campaign.pdfIn PDF document text
    • https://fofalada.weebly.com/uploads/1/3/5/9/135968840/lixokejizi-sagolovafomez.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/ibgdEXJ/jatinadumavuvujirekow.pdfIn PDF document text
    • https://reratuzofi.weebly.com/uploads/1/3/5/3/135346135/9578855.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/all_you_need_is_kill_manga_2-in-1_edition.pdfIn PDF document text
    • https://gavuwexis.weebly.com/uploads/1/3/4/7/134772394/newovijewixa-burabawunuve-zusuboxip.pdfIn PDF document text
    • https://cdn.sqhk.co/dasotipamu/ageaXB0/articles_exercises_with_answers_for_grade_7.pdfIn PDF document text
    • http://giwudogor.scienceontheweb.net/18285258812.pdfIn PDF document text
    • https://cdn.sqhk.co/pajubopolak/gjidcOI/pressure_washer_attachment_for_hose_pipe.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/what_is_the_text_structure_of_the_last_paragraph.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/how_much_to_make_an_indoor_soccer_field.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/vibuvomomuv/plant_and_animal_cell_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/wapejaf.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/how_do_i_reset_my_rcn_tivo_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/68596656119.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/top_praise_and_worship_songs_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/serum_beta_hcg_test_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/zizefoxumogazofedoxawo.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/jujew.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/madhura_raja_movie_collection_report.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_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 5132 bytes
SHA-256: f457834c207edad45af9183719a73b7bbf15ef798e0c9dbeeb4684d557008bc0
font_01_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 10736 bytes
SHA-256: c54740ec91b0f9c88001ad659a604997f9a320e4626a8f386e776ea15b29e4e5

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