Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf61e9f693e65de…

MALICIOUS

PDF

67.7 KB Created: 2021-03-14 06:13:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0b20d4c4880b3e00ecf74627192a59e4 SHA-1: 176ac51787fdced42f42e21c8b6c531548af3203 SHA-256: 9cf61e9f693e65deb8d6eeac1dbab42740e33fd57730e380aefa95f1e4063545
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=formation+agriculture+biologique+tunisie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453142/normal_603bfdf9ee0bd.pdfIn PDF document text
    • https://cdn.sqhk.co/reromiwo/fghidxv/economic_research_jobs_chicago.pdfIn PDF document text
    • http://rezokaxibipoj.22web.org/54630856127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_60250b5bf1a86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401558/normal_5ffadd2e6bb5c.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/OT2hfjg/skyscrapercity_aeropuerto_el_salvador.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488116/normal_5ff5693279a71.pdfIn PDF document text
    • https://cdn.sqhk.co/felebamifuk/difriaw/sumineteruzumowibegum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxexi/vunepanosewisosaxumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77b27c6-3859-4c13-8ec7-ae677c2bbeb3/sidewaturafolenuwupisaxek.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/zendesk_guided_mode.pdfIn PDF document text
    • http://lojupodinitaxug.epizy.com/object_oriented_programming_in_java_coursera_answers.pdfIn PDF document text
    • http://fopuzotetowux.rf.gd/mojijoxim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86a6249f-6acc-47b9-8ab4-ab8333133979/the_aeneid_book_3_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/48802554780.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/7267027115.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/69333073713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9f9990-b493-4ae2-8270-c22eb6a5c904/95842088966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f8b7b9-d482-4c78-bdec-f3f97a1e7126/55837392278.pdfIn PDF document text
    • http://maxegore.epizy.com/74495095743.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_off0000ca0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 5340 bytes
SHA-256: cab003f7b257a13a34b55a9c5233e33610fb30ef5988917ee9c2885fa43aea5e
font_01_sfnt_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 11012 bytes
SHA-256: ac045c6d41813a9da519e7467881d5d4ac39488aa6fab8b6dfceb478d09a4e48

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