Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31b16a75f8fb584…

MALICIOUS

PDF

77.9 KB Created: 2021-03-12 20:11:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 31d39309adcf8ba6786a61cc10341bf1 SHA-1: 592e043242b5e031d4f413d564e6b2aecbb00b11 SHA-256: d31b16a75f8fb5843acb4cfa28342d8cf59c5d813bf311940d4679dd426f4779
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://baarspo.ru/123?utm_term=algebra+1+unit+1+test+study+guide PDF link annotation
    • https://pafirolexorawu.weebly.com/uploads/1/3/4/6/134612045/xajovemoxupakaruzoti.pdfIn PDF document text
    • http://wurilozi.scienceontheweb.net/17323764302.pdfIn PDF document text
    • https://kofosobi.weebly.com/uploads/1/3/4/5/134528260/4966869.pdfIn PDF document text
    • https://korareledanos.weebly.com/uploads/1/3/4/3/134385748/9170022.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/anova_table_statistics.pdfIn PDF document text
    • https://defasoxajex.weebly.com/uploads/1/3/1/4/131405962/jeluda.pdfIn PDF document text
    • https://nekawosewifij.weebly.com/uploads/1/3/2/8/132815774/a31d1dab.pdfIn PDF document text
    • https://zotikukubufo.weebly.com/uploads/1/3/4/7/134773644/vutewenevos.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/828cf433-33c4-4ee1-9530-14daa4e0e402/how_to_do_point_slope_form_with_two_points.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc877fb-ad91-4ee9-9f40-85bd03af61c0/95665796064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae7bcc34-4dfe-45ed-a78c-b9daa928e750/refoperixesowixib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3613245a-ded9-4155-badb-ffd481c24ad4/16924747378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23baa00c-94f6-4527-a594-afd19e351643/how_to_connect_brother_hl-2270dw_printer_to_wifi_without_cd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89335d21-eb4d-46a8-af4f-976390d239a7/7075574502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcca76c7-9fe3-4487-bea5-0b35c76d6687/vefimosokopevivimile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12be1838-040f-4b93-8e01-537369690650/how_to_read_like_a_writer_mike_bunn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c13709e-dbf3-492d-8549-e86c841d4965/maschine_mikro_mk3_used.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e6d228-8fc5-42b8-ab22-ae04e5cae0b2/66110136553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/517e76c2-455f-4db3-a749-d94453310965/production_and_operations_management_kanishka_bedi_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ea019e5-0fac-400a-975b-4104ff8f93af/tp_link_av500_setup_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c78b26-bfe3-49a8-9dca-6e044f4f678e/49718899258.pdfIn PDF document text
    • http://misanedajog.myartsonline.com/statement_of_accounting_standard_1_30.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e648bd1-0ce6-41db-84df-f2fb5f691c44/kexifiwawe.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_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 5048 bytes
SHA-256: 328a4067ee564cd9900099ccbbe261a149f624205579d63c8905c394630462da
font_01_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 11916 bytes
SHA-256: 96763e6a26133c5b1161fafc1a764680d20e7607d09ec74a516e76d83502c60a
font_02_sfnt_off00011c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3