Malicious PDF — malware analysis report

Static analysis result for SHA-256 8166cd0eabd869b2…

MALICIOUS

PDF

72.2 KB Created: 2021-02-21 21:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 80b883677a3a3f009b2640361b9c610d SHA-1: ac7c82568e66a953d294eec8b382a5b944cad094 SHA-256: 8166cd0eabd869b2d543b1d787ddf10d0e529a2bd41998e7353ed1aa9a264437
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-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://jacksth.ru/wix?keyword=wheel+of+time+pdf+free PDF link annotation
    • http://rajulikarizamu.iblogger.org/99545224359.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/1Biaid9/miro_app_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491946/normal_602b72179fd6f.pdfIn PDF document text
    • https://cdn.sqhk.co/wekababu/odlickT/la_liste_de_mes_envies_resume.pdfIn PDF document text
    • http://idclick.cash/mifefimakitesfcknx.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/gjthj8E/kong_vs_godzilla_trailer_leak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_601d210460549.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/PijCTYi/viboko.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/lCIjbgd/turn_data_roaming_off_iphone_8.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/Xtgg1WC/75465440689.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453334/normal_5ff1c931c7dbe.pdfIn PDF document text
    • http://naturka.space/vegetarian_warak_enab_recipeair0w.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/vexeliku/france_information_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/androidx_test_github.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/48142245634.pdfIn PDF document text
    • http://vudagolefedofa.epizy.com/paytm_first_game_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/the_little_black_book_of_stock_market_secrets.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_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 4904 bytes
SHA-256: dffd2cd413282dfc7f484bf77b6899bd40b1cc3850a5f099362abeba189dd8bc
font_01_sfnt_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 11048 bytes
SHA-256: c3944ae41206b4f490a55f6df36b2098f13ccecacdc2ae20c49323fa2e03dfab

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