Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e1b0488a1eb7b7…

MALICIOUS

PDF

79.7 KB Created: 2021-04-08 05:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 01c1119afaa18868622fe432e5ed7cd8 SHA-1: da1329e19c0dfdaf70f2953f0d42c151f70dfc9b SHA-256: 73e1b0488a1eb7b72ef7a0c615231b3442d3768d8e6ccc8c2e8ec7e5e05de1a4
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed for phishing or malware distribution. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack, likely spearphishing, to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=how+to+get+a+discount+on+dish+network PDF link annotation
    • http://odemebayisitrafik.com/89791538023c2qwn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_601982cb38f95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_6069e278152e1.pdfIn PDF document text
    • http://spain50off.info/kali_amman_photos_hdzt4fb.pdfIn PDF document text
    • http://fovikoxesaweziz.medianewsonline.com/aikido_ground_fighting.pdfIn PDF document text
    • http://xalenupom.getenjoyment.net/promissory_estoppel_in_contract_law.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413867/normal_5ff5f9a8ba113.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5fc776638af5c.pdfIn PDF document text
    • http://doweryklkq.space/33828758756ozy50.pdfIn PDF document text
    • http://mavitrade.com/cc_nc_v_th__ca_ng_namx4raa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366400/normal_5fdef5cb9ce09.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/sabegokek/93181658651.pdfIn PDF document text
    • https://29fa80ab-3b21-46a5-a5c9-66d7a3d84e9c.filesusr.com/ugd/eb9fb8_ea6a882df3dc4c0986789e019ce0e29a.pdf?index=trueIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_523c51a4a7d149dd8d66683ef2c71c0a.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_a10dff2f405d44b6adf1052d5c89e0f6.pdf?index=trueIn PDF document text
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_25f8b3f7e80d47628db296560224a896.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/dovivipogamipetodanadu.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_9fb6744a044e4e91b4e133c68ea31980.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_5523046322c94f41842898d6c31a1c17.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_f819c459e5b2436fa5684c3b034af317.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mavixu/38432516512.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_a98903d5533243099c1f69997fbc6da4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/what_are_some_political_issues_today_in_america.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_ae4985171d024d749da77ddd8e35261e.pdf?index=trueIn PDF document text
    • http://viwuwijagabote.myartsonline.com/student_admission_form_format.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_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 5284 bytes
SHA-256: dcf9b1db661aebebe262b37cd2946e611ff7d9b6a5df2279b0fd033628300155
font_01_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 11604 bytes
SHA-256: ddfd18f43d6943ba612523c5df135628d8a86cec4bacd5e7ea78c9ea41f1b6d1

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