Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4fd4e57d275e39…

MALICIOUS

PDF

77.0 KB Created: 2021-03-21 01:47:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2d745fe8e5425651378375be1f9694c4 SHA-1: 9eede934a169d1c798e1b0fd3dc265a5f030c0f3 SHA-256: 5d4fd4e57d275e39a0368211fb02c4e8dada5a385d2984661cfff69678eec530
186 Risk Score

Malware Insights

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

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 0.9991

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://dugedepap.ru/strik?utm_term=resmed+airsense+10+autoset+wireless+setup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417313/normal_6035a2a9d7550.pdfIn PDF document text
    • https://sozikusek.weebly.com/uploads/1/3/4/3/134333331/xurenesira.pdfIn PDF document text
    • https://tirusagoxavux.weebly.com/uploads/1/3/5/3/135329940/nitopusojotilasan.pdfIn PDF document text
    • http://lotto-investclub.com/magna_carta_cloze_activity_answersmc2cm.pdfIn PDF document text
    • http://musc-media.xyz/xabemegatiewpkc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464530/normal_600e57a1b00a5.pdfIn PDF document text
    • http://buybritishcat.com/what_is_the_folk_song_of_japan8kpxc.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/nintendo_3ds_games_codesrm5a0.pdfIn PDF document text
    • http://plsale.pro/fozozuvutukukukunimotazoxqvxpw.pdfIn PDF document text
    • http://karaulovlife.site/17515602059f16sj.pdfIn PDF document text
    • http://strapslap.online/interior_stylist_jobs_near_meb3622.pdfIn PDF document text
    • http://newberginvestmentproperty.com/vamabipefazafob8x1g5.pdfIn PDF document text
    • https://fuvapele.weebly.com/uploads/1/3/0/7/130738919/zudabiw.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/magisikigoriboram.pdfIn PDF document text
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/f52cc6cc64cb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_602a8bb9220ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1f46a0-05c4-4658-9d22-15cc5cb578eb/tabla_periodica_de_los_elementos_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a21c09bc-f3d3-4e8e-bff6-3a68ceeb89f0/duracell_battery_charger_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fce0b03-32ea-479c-b2d6-7546188f6586/zulifufurevirovabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df1ccd1f-9c2a-4549-a268-9ddd827fe220/firiperod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83d6292-0c64-42be-822c-612751eb7a8d/190109084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ffbb17-3134-4b71-9878-cfc7000c0dc7/do_dachshunds_change_color.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a72be0b-524a-494c-a65a-6ed3b3aa7633/4796027893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/949a4fee-5c48-478c-843d-c6592dc116bb/is_konosuba_light_novel_over.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157b70e7-cd81-4c74-8756-b92d56033d00/oracle_12c_19c_support.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_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 5400 bytes
SHA-256: a36e28ca2206c9c81f875a83c47fabde629beb0801e3838e4fbc824b26817c81
font_01_sfnt_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 10544 bytes
SHA-256: 2d5ba560dd477928a9ae6ea0246521ead69c8bfd1475b6bb1a597f64ce6f4219