Malicious PDF — malware analysis report

Static analysis result for SHA-256 4712de20c1b7afda…

MALICIOUS

PDF

86.5 KB Created: 2021-05-15 01:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9d543dabca1c9efc22bdd3b73eb3b0e1 SHA-1: 1024c8b6ea81fb0168163bc92fed0e126f1ef28c SHA-256: 4712de20c1b7afda5e20afb0d6a0107de9889f2924d1094a0aa63f4be28f05ee
126 Risk Score

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-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://bologen.ru/strik?utm_term=module+7+statistical+reasoning+in+everyday+life+answer+key PDF link annotation
    • http://zedakobogesa.mypressonline.com/pewulemakusizi.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/jdhiigw/13232753890.pdfIn PDF document text
    • https://cdn.sqhk.co/kelulegawi/gfPxLge/65562395851.pdfIn PDF document text
    • http://zulesaxeririv.sportsontheweb.net/the_synthesis_and_characterization_of_inorganic_compounds_jolly.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/ji9xGhj/vatuserotaje.pdfIn PDF document text
    • http://gemapijipepegi.22web.org/naa_autograph_kannada_songs.pdfIn PDF document text
    • http://pefumaviba.22web.org/fepewonojesomasopujebo.pdfIn PDF document text
    • http://nufudoze.getenjoyment.net/egocentric_definition.pdfIn PDF document text
    • http://mojofaza.mypressonline.com/logic_puzzle_books_nz.pdfIn PDF document text
    • https://cdn.sqhk.co/limexofure/5jjP2ii/gevibogoxugavudajo.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/bZtgiSQ/56464019825.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/didowugorokirug/gcse_maths_foundation_probability_worksheets.pdfIn PDF document text
    • http://vugifoxo.epizy.com/kepezosoji.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/jurassic_world_battle_at_big_rock.pdfIn PDF document text
    • http://zeluwerilosa.epizy.com/how_to_repair_whirlpool_refrigerator_door_handle.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/authorization_letter_to_collect_documents.pdfIn PDF document text
    • http://xujekapowizi.epizy.com/reactjs_axios_post_form_data.pdfIn PDF document text
    • http://rusuxagek.rf.gd/25359732288.pdfIn PDF document text
    • http://rorokepu.atwebpages.com/scary_stories_to_tell_in_the_dark_alvin_schwartz_read_online_free.pdfIn PDF document text
    • http://kenalukebuv.epizy.com/83990026580.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/netflix_app_for_windows_laptop.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_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 5592 bytes
SHA-256: aca9e4ae285d0bba371727cd7ebb02d7f96a1b2fea00b896763cba147d0355ee
font_01_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 11712 bytes
SHA-256: 15f9278747d30c379af67dd763fd1bea4c7ad0f152c22f28d702aa45a2d733e5

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