Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf98c38747f115e9…

MALICIOUS

PDF

101.0 KB Created: 2021-03-31 08:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 061ad22255fb7f49d50d4e74d1f1f6f9 SHA-1: 55bde59b52904eaab403e372f58fc657f0f97f97 SHA-256: cf98c38747f115e975dc429b4d98337efa10fa14b083b40ca67dfbc2732392f6
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://vilenefex.ru/strik?utm_term=un+mundo+feliz+aldous+huxley+pelicula PDF link annotation
    • http://vashastrahovka24.ru/campbell_hausfeld_60_gallon_air_compressor_motor5mzsp.pdfIn PDF document text
    • http://vienvozvrat.site/sql_select_format_number_with_commas5al31.pdfIn PDF document text
    • https://mijugojibuva.weebly.com/uploads/1/3/1/4/131482988/6119981.pdfIn PDF document text
    • https://turulogir.weebly.com/uploads/1/3/4/6/134641543/19c32f03e7.pdfIn PDF document text
    • http://italiahot.fun/xejozizltbgz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puloxivomavari.epizy.com/purple_flower_wallpaper_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7f9862-9054-4766-b054-b613b0f3217c/solomons_organic_chemistry_for_neet.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_62c59d43c0a649c3a963b30b8b3e4f72.pdf?index=trueIn PDF document text
    • http://jogekofasi.rf.gd/88669795527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a541127-cd78-48a0-a397-667afd87c6a1/2304714244.pdfIn PDF document text
    • http://domulogud.epizy.com/74540620288.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_c9a50abfe8754247a35a88f98ef4542f.pdf?index=trueIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_06656b827ba54fd1be33ee251a10195e.pdf?index=trueIn PDF document text
    • https://1fae3a98-13b7-4b95-b1f0-1fbd1b7b0aee.filesusr.com/ugd/1da05d_1ca359e004c34e17b6a8496c5e8f5790.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d852807-10a5-41d4-8b5f-49b5b1ca0ce8/81062254444.pdfIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_0e79a0167ee7456a844c2601c4077a22.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_c36d88ec571f4e4fabbe5f623c057b8f.pdf?index=trueIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_4d8b307d87604bcb8f17b3617b2c73cc.pdf?index=trueIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_8d9897fc15a94491afe153095806da63.pdf?index=trueIn 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_off00014885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14885 5512 bytes
SHA-256: cb2daa77e0ce8838148332f9adc5729a27561a86751fda700ba521df92b74146
font_01_sfnt_off00015b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3B 12952 bytes
SHA-256: 851428fe01caefab51a88b802d67de55ba2b7c60296284e20a5826cd92e93e1a

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