Malicious PDF — malware analysis report

Static analysis result for SHA-256 640e13de7d975f4c…

MALICIOUS

PDF

74.9 KB Created: 2021-04-09 07:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da1c8132f95d09b5488ca62fb0da26c5 SHA-1: 69c45f0c6f45ffe4fdda58fb6c088fe3b8e7c39d SHA-256: 640e13de7d975f4cab39b8b3a825571e1f34fa87ecc8c4d309189cfb0eea5b26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to benign-looking documents, but one prominent link points to a URL associated with a phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to drive traffic to potentially malicious or scam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=who+will+pick+up+donated+furniture
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://kuwofadenokul.iblogger.org/kundalini_shakti_book.pdf
    • http://varuzajuv.22web.org/lanric_cable_ladder_catalogue.pdf
    • http://hurricane1.space/kabaddi_score_sheet_hdr6078.pdf
    • http://velavedi.iblogger.org/string_format_method_apex.pdf
    • http://levantemosaic.com/how_to_connect_hp_laserjet_m1212nf_mfp_to_wireless_networkiy2xh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_c9e51c823b294480861b79a8f76f5b06.pdf?index=true
    • http://kotafonapajawut.epizy.com/the_hierophant_tarot_love_outcome.pdf
    • http://dutuzapeka.rf.gd/network_marketing_business.pdf
    • http://regisebe.epizy.com/52334283758.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/pinuvubivo.pdf
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_3dd74ebc581743ff8b476656c167f7f5.pdf?index=true
    • http://raziwisubuza.rf.gd/gopro_hero_6_black_user_guide.pdf
    • https://s3.amazonaws.com/mufukep/psychology_of_web_design.pdf
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_335fc2d7b45048428b574f770c090c46.pdf?index=true
    • https://s3.amazonaws.com/somisilegex/libro_como_ganar_amigos_e_influir_sobre_las_personas_resumen.pdf
    • https://s3.amazonaws.com/jagux/fcra_investigative_consumer_report_authorization.pdf
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_a620e4ef72a74a1ca893016149caf1ce.pdf?index=true
    • https://s3.amazonaws.com/tawosutosuxi/is_it_better_to_cut_hair_wet_or_dry_with_clippers.pdf
    • https://s3.amazonaws.com/xijilesuzuxo/filijejep.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e799.bin
cbfb98c4f2acde2fe462e1e216bb270d227fca306be27c0b62ebf563260b8eec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 5236 bytes
font_01_sfnt_off0000f980.bin
e026196a7d77d40364e168ca89503e19368419a0ad4a46864a4acde6f7812579		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 10732 bytes

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