Malicious PDF — malware analysis report

Static analysis result for SHA-256 247d9165dae33f9d…

MALICIOUS

PDF

75.5 KB Created: 2021-04-03 10:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ec345c22da4966273c76d00d79526ab2 SHA-1: 85618301cbf6801a8d3ce070cd70cb9d13c05496 SHA-256: 247d9165dae33f9dd6fcfa86cc85d09391e59e2f8762b1be9b905515cfbc58d9
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 0.9999

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://nipisod.ru/award?keyword=abcesso+pulmonar+pdf PDF link annotation
    • http://winatesef.sportsontheweb.net/cannon_24_gun_safe_accessories.pdfIn PDF document text
    • http://sutivetowit.mypressonline.com/fazeranatuwanalakusevax.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://duxobibalarig.weebly.com/uploads/1/3/4/3/134360367/labuzojizaruwirukuj.pdfIn PDF document text
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/449153.pdfIn PDF document text
    • http://kigadotezolesun.mypressonline.com/50768758691.pdfIn PDF document text
    • http://blockhcain.host/one_punch_man_blast_vs_borosyo50l.pdfIn PDF document text
    • http://bageker.iblogger.org/editing_text_in_preview.pdfIn PDF document text
    • http://sumapewub.getenjoyment.net/anomalias_congenitas_genitales.pdfIn PDF document text
    • https://wisufisuzok.weebly.com/uploads/1/3/1/3/131383924/b1c92a38de6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rimamosapike.epizy.com/lauren_daigle_noel_sheet_music.pdfIn PDF document text
    • http://titugol.atwebpages.com/is_witcher_season_2_coming.pdfIn PDF document text
    • http://zoniguzetixan.epizy.com/autodesk_manager_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ecd61b5-aa39-4048-a2b1-20c00912e0e7/34543830139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f5a023-c18e-4c55-a105-236faf80b1bf/bodarumaloka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be413410-cd23-4f9c-8d80-5e299767ec6e/bimazelipefofotolowezub.pdfIn PDF document text
    • http://medelomozukomav.epizy.com/ramimaxemenawimage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0be9504-e98f-4e91-be6c-ea6961ac44b6/when_to_use_positive_or_negative_z_score.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_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 5432 bytes
SHA-256: bb7c9639e0f8791232f8e1e962767383fac871299fb5c9c169c611b9e0459d69
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 12524 bytes
SHA-256: 035802bfbc23c103e168fbf3fa1378e1bcbf24137c11af1036bb9b36fbab162d

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