Malicious PDF — malware analysis report

Static analysis result for SHA-256 5caeda92cc410619…

MALICIOUS

PDF

73.7 KB Created: 2021-03-15 10:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 16bcf578e33946ac58548689b329d173 SHA-1: 15167269e0bcd714411ac75f0079f973ee2c2c12 SHA-256: 5caeda92cc410619419b64acfa5429e73280255dcc31cc3856a4d644bdfd2901
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=manual+muscle+testing+chart PDF link annotation
    • http://dasezin.getenjoyment.net/19854201441.pdfIn PDF document text
    • http://womizepivilora.sportsontheweb.net/kenetopifagar.pdfIn PDF document text
    • https://fakadaro.weebly.com/uploads/1/3/5/9/135961508/22d1ee.pdfIn PDF document text
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/46e0c6.pdfIn PDF document text
    • http://pesuloduf.medianewsonline.com/vacuna_varicela_zoster.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_6035f04865f23.pdfIn PDF document text
    • https://simokatojerosu.weebly.com/uploads/1/3/0/8/130874490/a4d0204ef2.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/t-sql_pl_sql_syntax_differences.pdfIn PDF document text
    • http://tesubozapo.22web.org/lonusajazan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_602072d269ae6.pdfIn PDF document text
    • https://polalakenasi.weebly.com/uploads/1/3/0/8/130813885/pudigugetejagaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387243/normal_5fcb587b52c75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nifekubipaxo.epizy.com/jebavizak.pdfIn PDF document text
    • http://zotubune.myartsonline.com/79313086639.pdfIn PDF document text
    • http://vomifavub.epizy.com/sex_and_the_city_cast_2020.pdfIn PDF document text
    • http://fafezevasuba.rf.gd/negative_effects_of_migration.pdfIn PDF document text
    • http://sajipesexadagon.epizy.com/41777809406.pdfIn PDF document text
    • http://minirulo.epizy.com/photo_background_editor_app_apk.pdfIn PDF document text
    • http://zajupulavofawi.myartsonline.com/c_for_dummies_review.pdfIn PDF document text
    • http://xodupope.epizy.com/vefinako.pdfIn PDF document text
    • http://palibam.atwebpages.com/nespresso_capsules_catalogue.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_off0000e3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A8 5220 bytes
SHA-256: 7226724f8dcffa55775e02264325edc1bada19c1b335127dac5bcc65e5f8e24a
font_01_sfnt_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 10616 bytes
SHA-256: 8710d8cf70ce20b16256264bab9c0266d8c9ddfcd4878df6e38fac08c0e93499