Malicious PDF — malware analysis report

Static analysis result for SHA-256 05da48c433c649c8…

MALICIOUS

PDF

84.8 KB Created: 2021-03-04 13:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 74a45434d4ac57d0ed853204f19b4a58 SHA-1: 3ab77a9289ed60d2f99a91081ed7176e28679e4d SHA-256: 05da48c433c649c8071b75d74e36ddc32fff0ff5dcd3f69c7fa4ac3e99db727c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nipisod.ru/strik?utm_term=arifureta+from+commonplace+to+world%2527s+strongest+light+novel+volume+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481289/normal_602c4da359b19.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/line_graph_worksheets_5th_gradenktje.pdfIn PDF document text
    • http://daravto18.ru/light_meter_sekonic_l-_208gfrqd.pdfIn PDF document text
    • http://andyhongdigital.com/abbaigaru_pelli_naa_songsb9mkx.pdfIn PDF document text
    • http://foyou.store/385831358376y1lm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459640/normal_6026dfcf17688.pdfIn PDF document text
    • http://latuha.com/dogwood_tree_diseases_picturesqtpec.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/how_to_recognize_molecular_geometry5wpd7.pdfIn PDF document text
    • http://helpcontactform.com/wisejebtfj6k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426090/normal_6002bc0f40965.pdfIn PDF document text
    • http://dombitarf.ru/serato_dj_lite_guideprwva.pdfIn PDF document text
    • http://maturibcgj.space/powagexemekadalikaresimib6b0nj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_6030f61a1f347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475995/normal_5fd799fbeb95f.pdfIn PDF document text
    • http://whalesqpa.fun/how_to_draw_triangles_in_photoshopkxx6t.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/28041001757f3oij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481676/normal_602fbe5773656.pdfIn PDF document text
    • http://lady-bug.club/brooklyn_comic_book_store0cej9.pdfIn PDF document text
    • http://grandov.pro/how_to_work_a_room_chapter_1_summary7ulmn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_5fd3250718f5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tudawufed/logo_quiz_level_37_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/gedelimija.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/widimakujunurapexuko.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/toolbar_back_arrow_color_android.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 6372 bytes
SHA-256: 93bc2d6789c379e2d604bbe4f9bf573c0b0ae5d01389b1f59295c1836d7eaa72
font_01_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 5820 bytes
SHA-256: dea7ba593e2147088f8f3b9dacd7970db8e5fd3e4457d7fcee7cdfd0e0268c8b
font_02_sfnt_off00010f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 10796 bytes
SHA-256: b8c7714e308aa6588e341b2bf2e3aa24ed545ce1ee24cdd3739b253ea280647b
font_03_sfnt_off0001346f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2