Malicious PDF — malware analysis report

Static analysis result for SHA-256 79394fead8dffb56…

MALICIOUS

PDF

73.2 KB Created: 2021-04-07 22:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 18207be125f9adb271526e6d2c67d35d SHA-1: e2acfca5fbcb70a11b912658c9fb5afc086df61d SHA-256: 79394fead8dffb5672098ed0615569fd586efaf41d4e6a364081d6d78a762bd6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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
  • 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://pelibifir.ru/wix?keyword=kubota+parts+manual+entry PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451019/normal_6009d29814861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_6033e8ad9f0c2.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/cognitive_skills_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449622/normal_5fcbabe75648f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5fd69d44a58f5.pdfIn PDF document text
    • http://fidesuwuranotif.getenjoyment.net/approaches_and_methods_in_language_teaching_jack_richards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427793/normal_6005576fc472b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_601cc48e2b108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389809/normal_600d8ce9728c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_6038e32572d27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5fdc77965c992.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosakiviga.rf.gd/best_chapter_books_to_read_to_a_5_year_old.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef599ca-5b5b-4a27-a38c-030d1fece50b/chapter_10_dihybrid_cross_practice_problems_worksheet_answer_key.pdfIn PDF document text
    • http://sixijoras.epizy.com/jufokelakaxipe.pdfIn PDF document text
    • http://dowirimidezifa.rf.gd/99597810351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58471ad-c511-41f5-b698-674efc2ff374/boduju.pdfIn PDF document text
    • http://dosidojabar.epizy.com/bluestacks_install_apk_from_pc.pdfIn PDF document text
    • http://jijetesak.rf.gd/supply_chain_logistics_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec431758-b2ac-48c9-8350-3e368fe4393d/xenaxobesej.pdfIn PDF document text
    • http://ziboporo.epizy.com/mulutujemizegunezes.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_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 5176 bytes
SHA-256: 2e7ce0d3c7fbe2f8f80304b80da2e25c550c5096aada9f9e20998d764f49001e
font_01_sfnt_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 10360 bytes
SHA-256: 679c76613ab9530e25019f122b4137fcad215e39713ab7423e67a605068adf3a

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