Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b497df6b2eaa79…

MALICIOUS

PDF

72.5 KB Created: 2021-03-17 16:05:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eadf9d38a8669098ef0c8d11a0552d15 SHA-1: 3e74f106aba8fccf738408ea90afde5928d7a705 SHA-256: 88b497df6b2eaa79c08897f7a7c8b67db0510010b33a24d0f98e149ea6e42f74
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-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.
  • 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://druttle.ru/wix?keyword=johnny+appleseed+book+pdf PDF link annotation
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/sodudefomekazukusa.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/ghhb0Vf/declaration_dsi_revenus_2018_formulaire.pdfIn PDF document text
    • https://ditufanavuj.weebly.com/uploads/1/3/0/7/130738569/93631.pdfIn PDF document text
    • http://beautysale.site/lavibakigebyo94.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/farej.pdfIn PDF document text
    • https://cdn.sqhk.co/jifibipex/jdjcijG/70872650224.pdfIn PDF document text
    • http://levantegroup.net/nesekepetiluzijt7i43.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/c8282f6cb2.pdfIn PDF document text
    • https://joriwonakogilul.weebly.com/uploads/1/3/5/3/135305945/bidukavodanivab.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/jchi0Aa/top_songs_2019_philippines_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384164/normal_5fffb3ff69e3e.pdfIn PDF document text
    • https://cdn.sqhk.co/pulovafafita/fgBDZqM/top_songs_70s_80s_90s.pdfIn PDF document text
    • http://masterpowerpoint.com/sejulewebisivabefejexul36sj.pdfIn PDF document text
    • http://unlockdeals.shop/pilgrims_progress_summary_in_tamil41r39.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/eLhdeCZ/folenebamavazarifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_6050f0f75a7c3.pdfIn PDF document text
    • http://lojasamericanasbr.com/5844922249xujfq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA8 5328 bytes
SHA-256: 1ec7e1c76a3b78ca160133da0ecc4d7678075402a95012ad6c8d8e6a7e681e77
font_01_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 11008 bytes
SHA-256: c135032bb123dac5ae2b132f856b99f12645561f513412c99c0b0f46e18d971b

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