Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc677a45d6ffc0ba…

MALICIOUS

PDF

76.9 KB Created: 2021-04-22 12:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: dc0c604a56e2e45afee704bf8f89a942 SHA-1: 0fb9407b4a44e12aef627463131d89dd3b89da51 SHA-256: bc677a45d6ffc0baeff845f7a5d5ab33069e643ce29d5b7f6f509a40e1af210f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary malicious URL identified is https://maypoin.ru/strik?utm_term=link%2527s+awakening+fishing+tips+reddit, which is likely the destination for the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/strik?utm_term=link%2527s+awakening+fishing+tips+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503033/normal_601c92b7d96ee.pdfIn PDF document text
    • http://pakavoposot.22web.org/multidimensional_array_in_java.pdfIn PDF document text
    • http://wowogobofomufu.mygamesonline.org/cognitive_interview_techniques.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_6035297e865bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_6055f12675287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474192/normal_6039c0fc7a00d.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/tobito/brs_gross_anatomy_8th_edition.pdfIn PDF document text
    • http://kalilom.epizy.com/iv_convenio_de_ginebra_1949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c450b31-6f21-412a-92bf-6df37f79c5ca/understanding_architecture_book.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/hebel_wall_installation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c34e4d0-b701-4572-af5e-ca500d2fe1b4/htc_m8_battery_replacement_service.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/academy_stars_5_workbook.pdfIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_cee7a6831cde4c0ebe719d816c37312c.pdf?index=trueIn PDF document text
    • http://wavubodalut.epizy.com/notuxubuwigir.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_3526ea8b431948d8bb991c3271957a84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17dc6b49-9e12-4e48-8537-ecd40e3fa858/how_much_does_a_medical_interpreter_make_an_hour.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/5558411689.pdfIn PDF document text
    • https://92fbd7ca-8480-4723-bb2c-19523f9dca15.filesusr.com/ugd/29946e_b2e5b4e2695045b7932d697c2259555c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanaladu/interview_questions_for_high_school_students_to_ask_each_other.pdfIn PDF document text
    • http://moxurux.epizy.com/b_a_paris_the_breakdown.pdfIn PDF document text
    • http://fabavokawibawo.epizy.com/antenna_theory_analysis_and_design_john_wiley_sons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9817a5dd-7b97-4e20-8aca-8566803b05a9/contabilidad_de_costos_estimados_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5ee865-d916-42ac-9497-92b619b43e62/92075236548.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_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 5400 bytes
SHA-256: 8978d08f06ed669c69efdc7c96dcf236ba431208075837f8e0ea829c1d8ea5b5
font_01_sfnt_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 11176 bytes
SHA-256: fb69319befe66334ab758b32bb3bdd5b3ece9d775ecdcb285466bf1d739ee5ba