Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98b1458e05d73b0…

MALICIOUS

PDF

74.0 KB Created: 2021-03-22 14:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eae00e60d4f779f88b3b2d366548e94d SHA-1: 5a473623e7a416650edb146514361ad403626621 SHA-256: e98b1458e05d73b06a824b78848fce7dccc826beed5400515fbed47984702e55
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 0.9997

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/123?utm_term=catia+simulation+tutorial+pdf PDF link annotation
    • https://cdn.sqhk.co/nisugavu/jjje9jc/jododoxoriwufu.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/OcoNshi/33122634394.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/iijTQjg/farming_in_ancient_egypt_worksheet.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/a_level_chemistry_lecture_notes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5fc6810cc8087.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/do_all_wifi_thermostats_require_c_wire.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/hbIiegc/nursery_rhymes_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_6055153a7da83.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/jhhjg9U/new_cyberpunk_2077_countdown_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/wozovege/jdc4Zig/civilization_6_switch_strategy_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebililofo/tgdgjjg/dictionary_app_android_github.pdfIn PDF document text
    • http://gemajelibetojup.scienceontheweb.net/81675920003.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/what_is_the_latest_version_of_wii.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/cvhaRij/royal_fish_hunter_code.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/3936797230.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/76593214202.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/icYYITY/vazopasenorovejoruwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tofujuwo.onlinewebshop.net/68834029078.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/walmart_brand_center.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/kebiwedexozina.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/jozaguzisupopoke.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_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 5092 bytes
SHA-256: 8ccf2e89830a1a1ccd3bc9ac18b2958167cc5d394bfc86659a6c53d45ba5afe0
font_01_sfnt_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 10788 bytes
SHA-256: 4efa994eb6cdc9643543f77ef8bfb7b609ea988989be91b9b291f70a1095f705

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