Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9752f3ce0b92c5…

MALICIOUS

PDF

77.5 KB Created: 2021-03-14 06:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9d3bb5c3b4a9d3000c2548da7ce485ef SHA-1: 255568395a9d5d7b61359fd4b8c3037a35267ca0 SHA-256: ef9752f3ce0b92c5ba48eea57764883f15a6c1732d2881eb4fe665e7c950a003
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=certificado+camara+de+comercio+barranquilla+pdf PDF link annotation
    • https://cdn.sqhk.co/nuzozuni/giqxjfh/hashtags_that_make_you_go_viral_on_tiktok.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/bii2gfa/ebook_reader_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/hnFhjjb/fimonibuviwufafabemapemez.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/YQM2MlU/ant_smasher_download_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/8EDoFOw/72952981240.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/hcjaiaf/wuxipakakekatizigipipotos.pdfIn PDF document text
    • https://cdn.sqhk.co/rorifugera/1iijeFQ/chandrayaan_1_information_in_short.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/dGhaPia/centurylink_customer_service_number_phoenix.pdfIn PDF document text
    • https://cdn.sqhk.co/zanudiwageg/eWgi4jf/rectangular_prism_faces_edges_vertices.pdfIn PDF document text
    • http://bupomorefa.22web.org/80659671205.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/567ed0f7-81aa-489d-b86d-4d1729362a7f/ascii_table_c.pdfIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_0e826589ae8b457ba2a133927a6bc208.pdf?index=trueIn PDF document text
    • http://ramigavatezeten.epizy.com/front_office_football_8_guide.pdfIn PDF document text
    • http://mamisiz.rf.gd/36263931115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41d2513-b9d9-4f19-b01e-c7a8a5540126/how_to_purchase_stocks_in_singapore.pdfIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_d3a803b6d39d4498a04ab9cf027c4c97.pdf?index=trueIn PDF document text
    • http://zezevefo.rf.gd/gimp_photo_editing_tutorials_black_and_white.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_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 5292 bytes
SHA-256: c8051cb2360b57afab2cb68b102f2dde713df45198b857ab5d0117a79438054e
font_01_sfnt_off00010114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 11784 bytes
SHA-256: 2928070c1675990bf5ac9c7a664007b9a3ed3a6f7170281d2fa6f825a6becbf9

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