Malicious PDF — malware analysis report

Static analysis result for SHA-256 90231c7acdc29c38…

MALICIOUS

PDF

63.0 KB Created: 2020-12-04 13:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9c1c926a908c173abd3af67af84a0151 SHA-1: d9a67d21f2e0c5116820c3f2d439711bfc37141c SHA-256: 90231c7acdc29c38b34dc0a7e97a2615663f3f1b3b8901db3d4ab37c27c3bc5f
156 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 0.9998

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.
  • 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://trafftec.ru/strik?utm_term=wake+county+modified+calendar+2020 PDF link annotation
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/xekibon.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/7207546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_5f9625507213c.pdfIn PDF document text
    • https://mumixiginuwogi.weebly.com/uploads/1/3/4/7/134752923/pafime.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/fiwuzewawefujeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450243/normal_5fa62ace040df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc27b65a8793968641242c3/t/5fc62da83485235c869977ed/1606823339742/zombie_survival_3d_hack_version_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f975bf71053ccb109642/t/5fc16c00f3de5e49b59a254c/1606511616890/human_communication_devito.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc380a327a199023ac5df36/t/5fc87c4b13de6e79815c1d40/1606974539741/nikaniwezezamesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a58b210-cf59-42d1-b654-435aba87c3a7/create_a_new_page_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/urbini_reversi_stroller_red.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf59edae50a0145868aeb/1606219167944/operating_instructions_anne_lamott.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1c6b18-e484-45a1-8148-da06b1f376dd/17017635905.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_off0000b9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CE 5440 bytes
SHA-256: 96a34b1a183e7dcc57ed83524b754e88571fccefaa05daee7811ef42db5dfd08
font_01_sfnt_off0000cc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC54 10416 bytes
SHA-256: b5bcaf8ed18102de7f2095d0114a251c470a6c2af0a70229070f5261058df6c9

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