Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99b7a45d917f52f…

MALICIOUS

PDF

67.0 KB Created: 2021-03-25 13:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8759082a4d386847baf4b8864b163857 SHA-1: fca9d08f6be9e82f3b78007b78e182f981a1ac5d SHA-256: c99b7a45d917f52fddee03aae6bbd6af78346b4d6ea99cf3b177ad806b4ed29e
134 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. It uses an urgency-based lure. 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=manipal+clinical+medicine+book+pdf PDF link annotation
    • https://fogurasetaj.weebly.com/uploads/1/3/5/9/135961985/xozadujarega.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/fjgDiah/yellow_wallpaper_iphone_6.pdfIn PDF document text
    • https://rezisepadas.weebly.com/uploads/1/3/4/2/134235668/3bd7830cfc5.pdfIn PDF document text
    • https://cdn.sqhk.co/sururezog/gIhbkPQ/go_kart_racing_jackets_suppliers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476924/normal_5fcd17d62cd8f.pdfIn PDF document text
    • http://skout.tech/gonosizusowubuwfnou.pdfIn PDF document text
    • https://piwifagipob.weebly.com/uploads/1/3/1/3/131379899/f756462e1e5a.pdfIn PDF document text
    • http://bifakibebus.iblogger.org/automobile_engineering_kirpal_singh.pdfIn PDF document text
    • https://waretopaze.weebly.com/uploads/1/3/4/5/134529701/nimip.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/4ghN9XT/w3schools_php_date_format.pdfIn PDF document text
    • https://sozezitevi.weebly.com/uploads/1/3/4/6/134639304/3662140.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376380/normal_5feb60c071bfb.pdfIn PDF document text
    • http://vinakubos.22web.org/54796576802.pdfIn PDF document text
    • http://trysucre.pro/kunujijizewidowavajexyoa.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/natewared/gta_5_online_pacific_standard_heist_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/indian_navy_2019_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/vekuzukisizinivimafuxoge.pdfIn PDF document text
    • http://webujexujafobe.rf.gd/aprender_a_tocar_guitarra_muy_completo_gratis.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_off0000ca7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7A 5236 bytes
SHA-256: a06ec1719e23ff8930647eafc03e35b16620f2488277e9fdcefeebcb93f9e1cc
font_01_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 10084 bytes
SHA-256: fa43291d9f2ce9a5aac0d6b94f20b5413852a049332f54ad65c8aa939feb2548

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