Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7545d5392722df…

MALICIOUS

PDF

70.8 KB Created: 2021-06-02 15:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5c3aa7499d31098c4877e037165662e4 SHA-1: 8a6b0de27d68da9b502bdc8d003ef6443735f345 SHA-256: eb7545d5392722dfb1c1dda80917e536d83c600c3b904df0495ad0df64af2ecf
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 0.9998

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://coretry.ru/pbw?utm_term=differentiate+electrolytic+cell+and+galvanic+cell PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481828/normal_6051c0307a789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445743/normal_601f8431e968b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_601fb194b869c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488323/normal_603816477fc55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449417/normal_5feffa3033141.pdfIn PDF document text
    • https://rozinezo.weebly.com/uploads/1/3/1/6/131636990/zafudibivapipus-nitebip.pdfIn PDF document text
    • https://kixuvatapowow.weebly.com/uploads/1/3/1/3/131383305/35203596bec6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417652/normal_5fe599b964b83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144451701/begezajaba.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/7020004245.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/w/file/fetch/144490854/layers_of_the_earth_coloring_page.pdfIn PDF document text
    • http://ritijix.pbworks.com/f/xisifumupuveruni.pdfIn PDF document text
    • http://nukuxim.pbworks.com/f/integrated_math_1_volume_2_answers.pdfIn PDF document text
    • http://pukagij.pbworks.com/w/file/fetch/144471558/best_sunday_night_bars_in_atlanta.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/is_there_a_nintendo_switch_emulator_for_android.pdfIn PDF document text
    • http://zufumegi.pbworks.com/w/file/fetch/144422358/jufojekibitox.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/f/grille_salaire_secrtaire_mdicale_2020_fonction_publique_hospitalire.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/jukaziladu.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_off0000d96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 5172 bytes
SHA-256: 12409b2bf421ebfa992eb65330901e29232c6c9d4813c874eaa5e7558623bb1f
font_01_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 10212 bytes
SHA-256: 3d66b316cabd8a9037a8571145e5da73a12726d4b48b88aace3834eb005fade1

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