Malicious PDF — malware analysis report

Static analysis result for SHA-256 db75c45676f498ef…

MALICIOUS

PDF

72.2 KB Created: 2021-03-01 07:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4810ca0d7cfa6045b99a8112e8c7f494 SHA-1: 4bcda620ae0c70283e5e9e3e94f6160b613e2e33 SHA-256: db75c45676f498ef1597e537c11f064091cff2f070c1babc4bb697fb0a63c80d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.8222

Heuristics 5

  • 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 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.
  • 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://resalured.ru/award?keyword=american+government+and+politics+today+essentials+19th+edition PDF link annotation
    • http://topstudy.fun/note_20_ultra_review_cameral1146.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/Q3Rhbig/paul_hardcastle_musician.pdfIn PDF document text
    • http://shoop-fh.ru/drugged_high_on_alcohol_documentary_worksheet39y0f.pdfIn PDF document text
    • https://tuduzijusesuzi.weebly.com/uploads/1/3/1/4/131406801/fameno.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/fBhhMia/youtube_download_for_smart_tv.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/91449425932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454541/normal_601a260b5e213.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/heR277J/argentina_football_league_system.pdfIn PDF document text
    • http://legendbilisim.com/chapter_2_research_format_exampleko1jc.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/nabegajararenarofomovi.pdfIn PDF document text
    • https://cdn.sqhk.co/juzexokogim/hg7hbjb/57622180087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_5fd890f335b0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452599/normal_5fdcf954da358.pdfIn PDF document text
    • http://instofficial.online/patriarchal_theory_of_statelbqe3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotubune.myartsonline.com/fupevu.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/the_trials_of_apollo_book_2_reading_level.pdfIn 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_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 5848 bytes
SHA-256: dfc70f1311e3dc2c3e8da58cf90f48f1fda20c3c4ea23cb6f19d6d41cda7fb0f
font_01_sfnt_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 10736 bytes
SHA-256: 2a06113ffabed19032941e2e9d74b3f6d1403b072218dc34921c83dd0766df11

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