Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f307e1a9d2c3df…

MALICIOUS

PDF

61.0 KB Created: 2021-02-26 07:27:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d9c03766699c2fd684ddde0ac152e981 SHA-1: 2de5f53c089a2ee387d3a2be830909225e553951 SHA-256: 51f307e1a9d2c3df5e784573bad12f32aea0e48dfa884baa79e5d0b3d050b096
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one prominent external URI that appears to be a lure for academic search terms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable domains, often used to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

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://leonvi.ru/award?keyword=prentice+hall+gold+algebra+2+5-1+practice+answers PDF link annotation
    • https://cdn.sqhk.co/vatomepipiw/vhdwij1/action_resources_trucking_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/t7iijaR/25667919948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452217/normal_5fe1379309cb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462350/normal_5ffdc5e1ad87d.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/sony_sketch_ef_font_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fekurisakez/frgjidg/rhythm_engineering_glassdoor.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/prohf3u/airline_manager_tycoon_cheat_codes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402932/normal_5fdd144977bcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_6035464e80ab4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_60150dab78022.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/gbJYJRA/words_in_a_pic_249.pdfIn PDF document text
    • http://pigutun.myartsonline.com/50941249622.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/66008298730.pdfIn PDF document text
    • http://wupubobetob.epizy.com/historia_del_bautismo_catolico.pdfIn PDF document text
    • http://lipuwetaw.epizy.com/65591594425.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/the_penguin_history_of_latin_america_chapter_summary.pdfIn PDF document text
    • http://jedejuleler.epizy.com/capecitabine_mechanism_of_action.pdfIn PDF document text
    • http://jegunabozoxi.epizy.com/louise_hays_park_events.pdfIn PDF document text

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