Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fd01247d63baf1…

MALICIOUS

PDF

77.7 KB Created: 2021-03-10 16:32:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a0d3f421fe0bbfcefe498b021828631b SHA-1: 27ba5cff7a65725d745595bb436f4c1320d09be5 SHA-256: 91fd01247d63baf1ac48fca2da46f1bfe4424c4cc76e618b6fa44642270dc4b9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, suggesting a link farm or SEO manipulation tactic to direct users to potentially harmful sites. The embedded URLs and the overall structure point towards an attempt to exploit user trust or search engine algorithms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=jspdf+plugin+autotable PDF link annotation
    • http://it50disconto.pro/repubolusuzebojafixuxe828qk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_6012801155b82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499972/normal_6023d85fe63aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5fdfcf66630a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_5fd31701c9e9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_6040205653331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_602cfbcfc4162.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420924/normal_5fceebbdd17e3.pdfIn PDF document text
    • http://prizinsta24.online/zegusisuitx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481409/normal_600387342801b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_dc33e564b2924122a39417ba9e9fec00.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_f4bfc815dd9d451cb4c6c2eec0f7c5dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retisovojor/zitubavekusodetiravasixa.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/beautiful_flowers_images_free.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_e3689978e3b94267ba886db50860659e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/glue_plexiglass_sheets_together.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/product_and_process_innovation_in_the_italian_food_industry.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/68783039473.pdfIn PDF document text
    • https://cdnjs.cloudflare.com/ajax/libs/jspdf-autotable/3.5.14/jspdf.plugin.autotable.min.jsIn 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_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 5244 bytes
SHA-256: 7cee854c2a86ef2e501f97c11bd450f5278daa92583f227a18d16433859c4fd7
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 14348 bytes
SHA-256: 4afcf6c14054421a3d94c2b7175ebf949ee420cb3ad3eb214b37bb5f58f12183

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