Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce345293ba0cb92…

MALICIOUS

PDF

75.3 KB Created: 2021-02-19 17:11:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 38ad7cc6a41dd99adc48905222b6b719 SHA-1: dce50d06bbc2f230b77d017f31e992d7802a7977 SHA-256: 6ce345293ba0cb929292e48c9f3904fad45017dbacb1a039d4d11fc577616d00
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users to malicious content. The primary redirector URL is https://druttle.ru/123?utm_term=why+did+my+wireless+mouse+and+keyboard+stop+working, which is likely used for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=why+did+my+wireless+mouse+and+keyboard+stop+working PDF link annotation
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/redolidibajen.pdfIn PDF document text
    • http://afracheat3.xyz/trade_union_meaning71s36.pdfIn PDF document text
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/9781462.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/5608846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388041/normal_600178884b165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468259/normal_601723891c833.pdfIn PDF document text
    • https://jikopiso.weebly.com/uploads/1/3/4/8/134880631/winulekenax.pdfIn PDF document text
    • http://pozopamux.iblogger.org/44748317454.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jifesu/geniramebak.pdfIn PDF document text
    • http://nojosatu.epizy.com/compound_sentences_worksheet_for_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/world_map_without_names.pdfIn PDF document text
    • http://fuguxudurod.rf.gd/visio_gantt_chart_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/news_report_article_sample.pdfIn PDF document text
    • http://fukorow.epizy.com/64428979466.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/45963817950.pdfIn PDF document text
    • http://girifej.epizy.com/gainsborough_trilock_template.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_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 5784 bytes
SHA-256: 90ecc7c79b0608545e34393dbd061610ba284f8ec7e346984ae59ba91737ae7e
font_01_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 10776 bytes
SHA-256: 34947752d0ebff98319104dc9d312d53b91495518cf52918bf64fa266c77cc22