Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8a9b447c8b7518…

MALICIOUS

PDF

74.5 KB Created: 2021-03-28 19:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 01b772e66926787e8c76d4cdc80c4b6a SHA-1: 04c15639add4d2aabee6643465e612e414dd2e10 SHA-256: 2b8a9b447c8b751826694119e14a728d16a4f68eb34e77b99387f7ded6a28127
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://dafemum.ru/award?keyword=advance+ruling+in+gst+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5fcce9663020f.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/CiinhdR/donkey_kong_jr_mini_arcade_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/jupumezu/yifVNf9/scottish_championship_playoff_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426812/normal_5feb4b58b1e4d.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/jqgjcJo/nugiragemeziralixaviv.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/hDiesGL/ebl_smart_charger_user_manual.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/sidowuk.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/jonifapikulodinid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_6057e946e9e09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423715/normal_5ff978014eea7.pdfIn PDF document text
    • http://zuzovitedifuzow.22web.org/rubawiz.pdfIn PDF document text
    • https://cdn.sqhk.co/lalivaga/Jbhijgf/romantic_songs_2020_malayalam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mimodiko.epizy.com/arquetipo_definicion.pdfIn PDF document text
    • http://mabagojovas.epizy.com/bertrand_russell_power.pdfIn PDF document text
    • http://wesufonezis.epizy.com/unikey_cho_win_8._1_64bit.pdfIn PDF document text
    • http://duguteterexu.epizy.com/kolkata_durga_puja_guide_2019.pdfIn PDF document text
    • http://lejipuzab.epizy.com/popup_card_house_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19fea8d2-55d3-4bab-b3a3-75ac9c351378/morning_star_bamboo_flooring_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/958094b5-f938-4864-85ad-5ac1c778f5a9/92908879482.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_off0000e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D0 5372 bytes
SHA-256: 3c17e809ab5ca4d7eb669c5877b6d676d5ee1acf621aeaeaed77838451c52dd4
font_01_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 11444 bytes
SHA-256: 0847ea7178f42ce12922c53a5a08fa14da27cd5e4fe09db94ac0ac1f3fdaa920

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