Malicious PDF — malware analysis report

Static analysis result for SHA-256 972d19657d6b2a55…

MALICIOUS

PDF

76.8 KB Created: 2021-04-06 02:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7e38550993ed5dc0793a1892eb2ad103 SHA-1: c537822bc5ce4d5cc24b1024c8452b71f681f575 SHA-256: 972d19657d6b2a5574cb0818a46878776ca240b7184bbff5692a35ebddf351b8
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary focus on redirecting users to 'fokemale.ru'. The ML classifier strongly indicates maliciousness, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination. While no scripts were explicitly extracted, the presence of multiple external URIs and the ML detection point towards a phishing or redirection attempt.

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://fokemale.ru/strik?utm_term=what+is+humanism+theory+of+learning PDF link annotation
    • http://wivikaxebox.medianewsonline.com/barashada_xisaabta_dugsiga_sare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469355/normal_602ddbc744b57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425768/normal_5fcb0110de848.pdfIn PDF document text
    • http://balonixom.22web.org/vector_geometry_exercises.pdfIn PDF document text
    • http://sepozimog.scienceontheweb.net/tafseer_al_quran_in_urdu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_7b7dbeeb93c440588fbe718b11d6d34a.pdf?index=trueIn PDF document text
    • http://mivurukelino.onlinewebshop.net/nevuvuzulil.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/10069934098.pdfIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_eec3c13c4bee41bfb107dd0466228c6e.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_56f8c08112324cfa9c636ac33eab9605.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4933f9f8-d83d-4457-b8bd-89171ade52bf/interview_questions_for_admin_assistant_job.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/pals_guidelines_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76550a80-7e1c-4a2b-8db7-6db6255445f9/how_to_teach_speaking_english_to_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/emotional_labor_is_higher_in_jobs_that_require.pdfIn PDF document text
    • http://dakokaxawizepu.epizy.com/buxiwifegedilitivuz.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/california_king_bed_sheet_size_in_cm.pdfIn PDF document text
    • http://sekuwomexapa.myartsonline.com/hydro_pneumatic_system.pdfIn PDF document text
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_bf883cae1e9a4620be8954167c2e0136.pdf?index=trueIn PDF document text
    • http://pabotojixupi.atwebpages.com/behavioral_theory_of_smoking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7681fe90-d22f-4507-bcdd-48323d18f8fa/ejercicios_de_lectoescritura_primer_grado_de_primaria.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_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 5296 bytes
SHA-256: 7d68a28f001275df86d38e234fb71f16babf1b2767e0d87399ba29e44cd7761d
font_01_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 10664 bytes
SHA-256: 141cb9ac35118a367a26b2b857f9eed519af89fc318232922307d6cbdc3dda68

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