Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffef89503df60cec…

MALICIOUS

PDF

78.7 KB Created: 2021-03-05 20:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 028c365734df7d2db236331dfff34f95 SHA-1: 9564c080ddfc0ef5c47b1fa5c2ec41929baef784 SHA-256: ffef89503df60cec6cce965c19cf9200e7cdabdde4f4f5c1f7cb40c42be39185
186 Risk Score

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. 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 0.9996

Heuristics 6

  • 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 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.
  • 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/wix?keyword=ws+8.3+solubility+curves+answer+key PDF link annotation
    • http://okclub.org/bella_s_lullaby_piano_sheet_music_original3487d.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/sixoluzutosegakoloba.pdfIn PDF document text
    • http://sibogufurab.medianewsonline.com/doluwapazanufe.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/dhaievI/easy_moist_chocolate_cake_recipe_with_oil.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/fbChfjg/61626000887.pdfIn PDF document text
    • https://cdn.sqhk.co/mizipudi/irZPLgi/82660433627.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/mUq0mih/rwby_yang_x_male_wolf_faunus_reader.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/el_juego_del_angel_resumen_por_capitulos.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/xosefidarefojamox.pdfIn PDF document text
    • http://aromaita.space/what_is_community_service_definitionbt98g.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/jfifie9/business_plan_quick_forecasters.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/noximogiwunok.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/guide_to_99_smithingpsmjk.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/hcwihcn/download_battle_plan_mod_apk.pdfIn PDF document text
    • http://ttop-shop.com/disney_corporate_social_responsibility_report_2017am5my.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/computer_ki_define.pdfIn PDF document text
    • https://cdn.sqhk.co/fowurona/hiihNif/prince_dress_up.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/is_the_anarchist_cookbook_illegal_in_the_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_9234c84ac05a4196a84354c7edaea441.pdf?index=trueIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/71322761099.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_e67d3f4311cb4981b68acb595f89f77f.pdf?index=trueIn 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_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 5652 bytes
SHA-256: 7099663ed79386517f60d9859121c387311ab5eb5b0fe743d751de2176d5a941
font_01_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 11548 bytes
SHA-256: 7d51f4bd479cc255e42b0cb1445799e647b652b9b79131b86b6fe39390341208

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