Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f056ccfcf77b572…

MALICIOUS

PDF

76.2 KB Created: 2021-03-13 23:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0ed84e4cd5d3ba8bed82a583800f7fe SHA-1: 24a6ba4ac22f24d0c1778a4c269967c8ec195397 SHA-256: 6f056ccfcf77b57209bb6d089a3b91664a4c392452903b049c717a8593403614
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to a suspicious PDF. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the structure suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/wix?keyword=hot+tub+removal+portland
    • http://fapasevusiledap.mygamesonline.org/kabafasadosefuxowasi.pdf
    • https://cdn.sqhk.co/balijanawi/Ojj7xgd/destroy_all_humans_remake_final_boss_guide.pdf
    • http://gifagudilul.mypressonline.com/bread_baking_for_beginners_bonnie_o_hara.pdf
    • https://cdn.sqhk.co/lokojagivel/5jbCw9h/sotefeku.pdf
    • https://cdn.sqhk.co/maxegugej/Qgfw8yN/38615702342.pdf
    • https://cdn.sqhk.co/gidulikegel/gRQhbha/91942378883.pdf
    • https://cdn.sqhk.co/pufowuvikij/idgSjiH/91089938304.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_4d713cd1934945578821e8217d0e54f8.pdf?index=true
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_bd0ac734711446db8ff330ad00541442.pdf?index=true
    • http://povodakav.myartsonline.com/lenosura.pdf
    • https://uploads.strikinglycdn.com/files/286547a7-cccf-45f6-8100-11c4907be9bd/como_hacer_un_bosquejo_para_un_ensayo.pdf
    • https://uploads.strikinglycdn.com/files/0428c381-36a5-4ef5-88f9-6025942b8649/51384152665.pdf
    • https://uploads.strikinglycdn.com/files/7fee2400-1aa7-48d6-b494-1a0dc8c2eed7/88184964789.pdf
    • https://uploads.strikinglycdn.com/files/3d38df04-277d-4814-9d23-03d7f9677fe9/possessive_nouns_worksheet_grade_4.pdf
    • https://uploads.strikinglycdn.com/files/21fa1bef-d7a0-44f8-ba78-28780fd58c4e/how_much_does_a_site_engineer_make.pdf
    • https://uploads.strikinglycdn.com/files/4874c927-b497-4972-b705-fa385a6c1b99/mental_health_screening_near_me.pdf
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_e6abc0b16dc64493b8ef44f1f465110a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9d803013-597a-4b89-938a-1d83b3a5b0ae/mulesa.pdf
    • https://uploads.strikinglycdn.com/files/8a99d45d-c2d0-476e-9992-226595da9418/how_to_compute_financial_ratio_analysis.pdf
    • https://uploads.strikinglycdn.com/files/704c0502-09d6-4b43-b9c9-597d291591c2/hillsborough_county_school_district_teacher_pay_scale.pdf
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_4daa3fa15cb24ce79f28e989af5d8dff.pdf?index=true
    • http://lijowavatajo.myartsonline.com/moparisinon.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_off0000ed24.bin
be7b672e8b550aa839236cc27d574a60f5c1744506d438e422f6dae1f89243c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 5088 bytes
font_01_sfnt_off0000fe54.bin
86144d9a2d4de30a7bbdc98db4c0a717e399d1994e712f9387efac688ffcbc79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 10980 bytes

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