Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb97631f8b4d0f2…

MALICIOUS

PDF

75.5 KB Created: 2021-03-23 16:58:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 90d65bd1ead3e25e6426d5f9e33048ae SHA-1: 07294d771c6deed52f4b62fd4902bb7a54dbe775 SHA-256: cbb97631f8b4d0f21416a199fbce012b0e16334417b2aa93e3c2d2f32f9b2c24
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, which is characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to host phishing content. The embedded URLs suggest the primary goal is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=maa+curriculum+guide PDF link annotation
    • http://jedusajinud.mygamesonline.org/xadaminumubesuxeze.pdfIn PDF document text
    • https://cdn.sqhk.co/daladovum/tGieQ3v/freedom_mortgage_irrrl_rates.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/ypCjbge/tumoxetiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/retirijozi/Yggjgum/smart_connector_keyboard_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/hijahcX/crunchyroll_download_watch_offline.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/the_jazz_real_book_sax_-_eb.pdf.pdfIn PDF document text
    • https://cdn.sqhk.co/guzufaseba/p9hiibZ/geometry_dash_2._2_date_de_sortie.pdfIn PDF document text
    • http://kajuzumanaz.sportsontheweb.net/livros_para_aprender_frances.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/haRiUfX/brandy_piano_man_lyrics_video_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/9hgXmgj/kajutotanebuk.pdfIn PDF document text
    • https://cdn.sqhk.co/vuluzazogur/hieigib/buzzbreak_version_1._0_7._3.pdfIn PDF document text
    • http://rajajime.mypressonline.com/definition_of_teaching_methods_and_strategies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_960a2908339545fd9187604cbf37cc0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/android_civilization_like_games.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/amusing_the_million_thesis.pdfIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_9d32aff85e3f4a1e85ba3772a3f6e138.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_cf361535f52b4de397e3bb3a7c932fdd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jonora/18946362703.pdfIn PDF document text
    • http://ludugatitabi.atwebpages.com/ladavufex.pdfIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_defdac5596944d559ce480fb9d9bda6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/bucket_list_movie_2018.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_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 5084 bytes
SHA-256: 8358a1761cbcda5ba83f522f45813929ba885903ba6f1654cf08e2cd0b041fdb
font_01_sfnt_off0000fba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 10524 bytes
SHA-256: 9fc85fa7abd184bd7fdcf8cb7b7a1ca91f1a6dc62c6a4c9f1b654ef43d1a285e