Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbe5b0b6593f17a…

MALICIOUS

PDF

75.2 KB Created: 2021-06-01 09:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2b0763e231e2d8b3876c630627fb0619 SHA-1: 1b1a515a45db3168deb7e10485adea6dc66388e7 SHA-256: 8dbe5b0b6593f17a918f37c14db2d6e67037129a73b26766cc8f0a57ceb1de66
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 6

  • 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.
  • 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://nomylo.ru/pbw?utm_term=harper+biochemistry+32nd+edition+pdf+free+download PDF link annotation
    • https://tedunifadikave.weebly.com/uploads/1/3/7/5/137505165/d8ed340494b.pdfIn PDF document text
    • https://wuwifure.weebly.com/uploads/1/3/4/6/134647121/730f5.pdfIn PDF document text
    • https://pilitopamazi.weebly.com/uploads/1/3/4/3/134313639/5307050.pdfIn PDF document text
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/1733988.pdfIn PDF document text
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/domazabu.pdfIn PDF document text
    • https://jakinazar.weebly.com/uploads/1/3/1/0/131070367/zowuranuxo-wutarosoge-jiwev-wazujexesabulo.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/fusukapivupula_denurezu_tivazopefaz.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/fekajokafu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aecbe2f0-e655-428d-badc-db8e82fc3966/kijepugamegidej.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/f/the_maze_runner_series_plot_summary.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/teoria_del_aprendizaje_por_descubrimiento_jerome_bruner.pdfIn PDF document text
    • http://kelivesas.pbworks.com/w/file/fetch/144442395/fesujan.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144424647/14470124712.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144449457/73186454283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/098c3788-5bdd-4bf5-86c9-33b6d8820db9/11459705363.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/download_hextech_repair_tool_league_of_legends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f58b0fc8-b1dd-4f85-92ec-96fab931937d/jisolekuporego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e3822f-ebab-486f-953d-286873c8ac20/23536916334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33645cb3-805c-4931-b8ab-3b7bc9f1e944/rowufodexigefedokewo.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144423570/43012711863.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_off0000e2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 5984 bytes
SHA-256: 1f321d2e4f14d3bf145843ff89a190e0d30badf428601d2e3ffb9b70c109d250
font_01_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 11500 bytes
SHA-256: 0c2a79b7f9707839e65c57d2b9bd411ee87b86a13099e402ea0067f5f504aade

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