Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c613ef96250019…

MALICIOUS

PDF

67.6 KB Created: 2021-02-25 09:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: eb8cafb145c229638403a39866f757a3 SHA-1: 759989e470d4241590385b9f1215b28a97916f84 SHA-256: b7c613ef96250019a305eac782732cdfa02c475e8851a53dbe0943514ad8d71c
124 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, likely to improve search engine ranking for malicious content or to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9705

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/aws?utm_term=why+does+god+seem+silent PDF link annotation
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/461978.pdfIn PDF document text
    • http://meduduwaje.22web.org/android_auto_day_night_mode.pdfIn PDF document text
    • http://mon-cmso.best/ecb_coach_session_planner_template117s2.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/175501.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/86805770648.pdfIn PDF document text
    • http://sq11mini.com/import_chrome_bookmarks_into_brave_android1qpor.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/50355720191.pdfIn PDF document text
    • http://1xbets-reg.site/dovedegtnrb4.pdfIn PDF document text
    • http://christinaanddavid2019.com/1883547118281tbz.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/gedimuta/pewesonasorumuwemekup.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/electric_yellow_african_cichlid_breeding_information.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/what_is_the_most_used_drug_in_canada.pdfIn PDF document text
    • http://lizusesujujes.rf.gd/in_on_under_next_to_between_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/ajax_php_form_submit.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/how_to_sell_a_note_on_real_estate.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 5048 bytes
SHA-256: e0906c73030b64737374a62db6e68fbd3eaad8d37974124b10bfe18f80a8b8c9