Malicious PDF — malware analysis report

Static analysis result for SHA-256 155a1627b984a981…

MALICIOUS

PDF

78.9 KB Created: 2021-03-25 15:02:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0f89f54c540ff6a000084799845580b7 SHA-1: f2e123365fccf0ff84ba511c55bbadb635912efe SHA-256: 155a1627b984a981c9576a95b4b6580ce1c16131280b44dae29251d0c3803c1b
66 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URIs, with one pointing to a suspicious domain ('ponafet.ru'). The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates the document is designed to host numerous links on disposable hosting, suggesting a phishing or spamming campaign. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://ponafet.ru/strik?utm_term=clarice+%2528silence+of+the+lambs+prequel%2529 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474223/normal_6018bbd40634d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_603f240b5982a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_60386a093dace.pdfIn PDF document text
    • http://tulakijumipad.22web.org/hays_salary_guide_malaysia.pdfIn PDF document text
    • http://ruxiroxawem.22web.org/application_letter_for_scholarship.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_601ebfe84c6b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_60565f5a7ebd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_025c477201ff4bb09614f907a8d6f5c1.pdf?index=trueIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_23b932672e2d4364b5f63523fd02afe8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/sutisuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3db7514-8d55-4ac9-8ce6-3f24fcece1be/65539293446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c974598-614e-4702-83b3-fa08a6a9c21d/the_boy_in_striped_pajamas_summary_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/34183564667.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_5b2d318a662d4722a01d9e4094d52bdc.pdf?index=trueIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_fdd6b5a6c65547679a5fc5b74bbc7ce3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f5a43d0-5a9d-411d-be5c-c5c4d4942d15/the_blade_itself_review_guardian.pdfIn PDF document text
    • http://sapifux.epizy.com/82031535104.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/gefafowujovokazek.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_1eb199ea3a494dd88e3330d2a91cd5ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/gisibuzuwepupa.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/paliwepebafemegubadikix.pdfIn PDF document text
    • http://bozumux.epizy.com/12423745102.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_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 5580 bytes
SHA-256: a2f0c991ad37dfeba8180d08fd8d2717e98882c35e56b759df61417f61186764
font_01_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 10980 bytes
SHA-256: 842ce3e1adfa6bb747e0fc762da5788a2668aeacd258b57523e8dd996c53ba43

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