Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5d051185bcdb0b…

MALICIOUS

PDF

80.4 KB Created: 2021-03-05 14:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 205d4766ace442ac7b79e763a079c9c9 SHA-1: 94676bace77c80914a396962c447af62d0c41847 SHA-256: 9d5d051185bcdb0bd2ef09e81852656a5a331f354f92f67d5b53f6a952aaa637
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 0.9996

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://maypoin.ru/strik?utm_term=how+to+clean+waterpik+wp-100 PDF link annotation
    • https://lotepipi.weebly.com/uploads/1/3/1/4/131454034/49445.pdfIn PDF document text
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/denazerefepipox-puvemebo-jibotorubebaj.pdfIn PDF document text
    • https://mizabago.weebly.com/uploads/1/3/5/2/135299272/2390673.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/3083507288.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/b3bfa2b7.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/gofujotomoketumekupip.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/48920d09.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/5e0497add41c8d.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://uploads.strikinglycdn.com/files/b07866fb-ee90-4176-8dd5-f4d9b75cf4bb/66065698051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/831721a7-9749-460c-81fb-c7c407ed70ac/elm327_mini_bluetooth_software_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8e028f-375a-40f2-9e51-545292ace2ac/navesewobelegodenuxigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b7a2a0-ee8f-46a9-b02b-49ab8c8ea39a/nespresso_lattissima_pro_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4abda114-aeef-4750-9ac2-3eb7119690e0/4176676972.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/elkay_drinking_fountain_repair_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22e12fe1-b84c-4b8b-a72c-421591bcbab6/nintendo_64_n64_emulator_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5da50f-ea71-4dc0-a653-cd1ae7df367d/what_is_a_breach_of_health_and_safety_at_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e53feab-017c-481c-a1d4-cc4acd456c5d/nextbook_10.1_tablet_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a43926-6d6a-4a0c-93b9-31e375eaccce/fojezes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe5174d-5fde-4a93-a6bb-f874fc301c80/automobile_mechanics_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8880786b-d668-4efe-8c54-4a83dd1bc0e4/the_five_dysfunctions_of_a_team_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea991705-a26e-4641-beb3-b0130e06c6b7/kedalekam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 4880 bytes
SHA-256: c36c0682f2774bca0dbd365cc4a84a9141ee87216977c71d38b94355c2199474
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 10796 bytes
SHA-256: 1f29798b8b6bfd41f2a38f93d2080111e2cb1d256fa89822a9b55533d9ed6a83
font_02_sfnt_off000124b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3