Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e2f22e593bd5c5…

MALICIOUS

PDF

76.9 KB Created: 2021-04-03 13:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7034088e452bf4c27ac2915825ab7961 SHA-1: eada11e358bb76c8c5e1c4a61ae206e52533bf14 SHA-256: 78e2f22e593bd5c502d0076f37db56efe7909202e0d82a684f3d7ea59fae309e
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary target being 'https://zajinet.ru/strik?utm_term=machine+learning+and+deep+learning+in+python+using+scikit-learn+keras+and+tensorflow+2'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm hosted on disposable domains, suggesting a malicious intent to redirect users. While no scripts were explicitly extracted, the ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=machine+learning+and+deep+learning+in+python+using+scikit-learn+keras+and+tensorflow+2 PDF link annotation
    • https://redojakora.weebly.com/uploads/1/3/2/6/132682723/83c27ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451762/normal_601850cf36420.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489724/normal_5ffd8045b1ad4.pdfIn PDF document text
    • https://cdn.sqhk.co/gipudeviwapi/sBidja7/psycho_circus_escape_game.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/42928593466.pdfIn PDF document text
    • http://tujugataro.22web.org/kabalevsky_violin_concerto_free_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/nozesinipi/X8gjutY/givizibegowidokozabojazu.pdfIn PDF document text
    • https://cdn.sqhk.co/xamewivuvus/jcLJQPf/facebook_lite_for_samsung_z2_tizen.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/44936853254.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/basic_physics_of_atoms_and_molecules_fano.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/gggi8gd/10_interesting_facts_about_meerkats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_6025cea04f241.pdfIn PDF document text
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/78cd69fdc017e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_888ed333c152417c98a9b2a1739de8eb.pdf?index=trueIn PDF document text
    • http://kubalomarupageb.epizy.com/70136701683.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_d43035ee3e174f098f368775a652316c.pdf?index=trueIn PDF document text
    • http://feduvilez.rf.gd/dituwe.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_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 5844 bytes
SHA-256: 993d99abbb8f5ae5861669c5cede2a4605d6f8af6fd15d47d8c7c75c6df1f0b8
font_01_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 10880 bytes
SHA-256: 1c8ed9c3b4a1405e3d236ce6ecc119dfcd2e14bb7e90b00703a1fb05133759f5

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